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#1

Lactase Enzyme Simulation with Data Analysis

sim819902 runs
29851.5
#2

Photosynthesis Model

sim119243 runs
8271.7
#3

Evolution and Natural Selection

sim89122 runs
7445.6
#4

Population dynamics of white footed mouse

sim96472 runs
6427.2
#5

Information Processing and Neurophysiology Model

The main dependent variable measured in the model is the membrane potential (millivolts) of two diff ... Read more
The main dependent variable measured in the model is the membrane potential (millivolts) of two different neurons in a series. You will be able to add excitatory and inhibitory neurotransmitters, and compare how these modulate electrical impulses of the two neurons. Additionally, you will be able to compare the effects of three neurotoxins: Tetrodotoxin, botulinum toxin, and sarin nerve gas. While extremely lethal, these toxins are very instructive in understanding neurons because of the specific way the toxins act. Each toxin modifies or inhibits a specific molecule in neurons that help process and transmit information.
sim68071 runs
infromation processing neurophysiology biology
4550.7
#6

Cellular Respiration Inquiry

Model of the dynamics of the metabolism of one mole of glucose. Randomness is built into the computa ... Read more
Model of the dynamics of the metabolism of one mole of glucose. Randomness is built into the computations.
sim28870 runs
metabolism respriation ATP biology
2888.8
#7

Cellular Respiration Accounting Model

The purpose of the model is to understand how glucose is metabolized, and how the energy stored in i ... Read more
The purpose of the model is to understand how glucose is metabolized, and how the energy stored in its chemical bonds is transfered.
sim25952 runs
cellular respiration aerobic respiration ATP biology
2579.9
#8

Evolution of LAP Allele in Mussels

sim24475 runs
Evolution Natural Selection Cline
2411.5
#9

Lac Operon with Monod Bump

sim34333 runs
Lac Operon Gene Regulation mRNA
2326.1
#10

Lactase with Variable Sample Sizes

Arrayed Lactase Model
sim47630 runs
Lactase array sample size biology
1938.55
#11

College Loans

Each year, the cost of a college education continues to rise and more and more students must turn to ... Read more
Each year, the cost of a college education continues to rise and more and more students must turn to student loans to complete their education. But as graduates leave college to embark on their careers, they face an almost Sisyphean struggle with student debt, forever facing an uphill battle while carrying a heavy burden, only to find they are getting nowhere! Whether you are graduating from college or just entering, we hope this model will enable you to better understand student loans and help plan for your future.
sim16896 runs, 429 downloads
Download Model
Student loans loans college interest repayment
1765.3
#12

Lactose Operon: An Inducible System

In this simulation users explore the negative feedback system of the Lactose Operon found in bacteri ... Read more
In this simulation users explore the negative feedback system of the Lactose Operon found in bacteria. Lactose induces the system by inhibiting and inhibitor.
sim25751 runs
Inhibition negative feedback biology lactose operon
1470
#13

Limiting Nutrients in Aquatic Ecosystems

Experiment with a variety of nutrients that are limited by different degrees in four different ecosy ... Read more
Experiment with a variety of nutrients that are limited by different degrees in four different ecosystems.
sim17229 runs
limiting nutrients ecosystem biology logistic growth
1259.1
#14

Steady State in Freshwater Ecosystems

sim12368 runs
1218.7
#15
sim10274 runs, 1 download
SDG policy integration coherence simulation
1020.1
#16

Zombie Apocalypse

This is our first model in the From Imagination to Simulation series. It is a nod to the Halloween s ... Read more
This is our first model in the From Imagination to Simulation series. It is a nod to the Halloween season and investigates a zombie apocalypse! Our fascination with zombies continually grows with the help of movies, TV shows, and books that give a wide range of zombie possibilities. But what are the dynamics behind a zombie epidemic? This model will specifically look at the spread of a zombie outbreak and examine some of the variables that help and hinder the rate of infection. We hope you will continue to see the benefits and versatility of Systems Thinking and enjoy our new series, From Imagination to Simulation! Continue to ponder those out-of-the-ordinary problems. They may seem unrealistic, but perhaps some of their dynamics may resonate with reality. Check out our zombie apocalypse model to see if there is any chance for human survival!
sim9680 runs, 161 downloads
Download Model
Systems Thinking zombies epidemic disease susceptible
1018.3
#17

Water Potential and Osmosis

Factors that affect the flow across a semi-permeable membrane.
sim23636 runs
951.85
#18

Oral Absorption

This model is based on first order absoprtion in a 1-compartment model
sim9096 runs, 53 downloads
Download Model
Drug Absoprtion Bioavailability Bioequivalence
921.6
#19

Circadian Clock in the Mouse

Transcriptional Translational Feedback Loop in the Mouse
sim9219 runs
Mouse Circadian Clock
914.4
#20

Diffusion of a Spherical Cell

Why are cells small? This model allows users to see how the size of a sphere affects the rate of dif ... Read more
Why are cells small? This model allows users to see how the size of a sphere affects the rate of diffusion.
sim10007 runs
diffusion surface area volume radius
911.95
#21

Vacation

Do you ever feel like work is taking over your life? Burnout is generally characterized as a state o ... Read more
Do you ever feel like work is taking over your life? Burnout is generally characterized as a state of mental and physical exhaustion resulting in low productivity and de-personalization and is most likely caused by prolonged stress that does not dissipate. There are many different aspects that affect both the building and dissipation of burnout. This model focuses on workloads and vacations to see how they contribute to both your level of burnout and productivity. Use this model to ask questions about your workload and any benefits you would receive from taking a vacation. What happens when you suddenly have a bigger workload? What happens when work piles up? Does vacation increase or decrease your stress levels?
sim8642 runs, 149 downloads
Download Model
Vacation burnout stress productivity workload
910.8
#22

Transformation Simulation

Simulation allows students to test the transformation principle. Two major goals of the experiment a ... Read more
Simulation allows students to test the transformation principle. Two major goals of the experiment are: 1. Allow users to see that supernatant from heat-killed bacteria can transform the genes of another bacterium. 2. What transforms the inheritance of the bacteria is DNA, not RNA or proteins.
sim8901 runs
transformation DNA biology
899.6
#23

Photosynthesis with Variable Sample Sizes

Sample sizes of Photosynthesis stocks in an array
sim7652 runs, 26 downloads
Download Model
766.25
#24

Administration routes

observe three type of plasma concentration curve, and combine three of them
sim10803 runs
Pharmacokinetics intra venous bolus div p.o.
744.65
#25

Pharmacokinetics: An IV Injection in a 1-Compartment Model

sim7208 runs, 44 downloads
Download Model
713.6
#26

Extinction Vortex

sim6671 runs
654.7
#27

Thyroid Hormone - Negative Feedback

sim7930 runs
negative feedback thyroid hormone metabolism biology
637.3
#28

Recombination and Gene Linkage

sim27823 runs
631.8
#29

Macromodel

Model for the public policy testing
sim5350 runs, 11 downloads
Download Model
533.65
#30

Intravenous Infusion

This model demonstrates the pharmacokinetic characteristics of constant continuous drug administrati ... Read more
This model demonstrates the pharmacokinetic characteristics of constant continuous drug administration.
sim4310 runs, 22 downloads
Download Model
drug pharmacokinetics intravenous infusion zero order input constant continuous drug administration
442.15
#31

Mulitple Bolus Injections Pharmacokinetics

This model shows the typical plasma concentration profile associated with the administration of seve ... Read more
This model shows the typical plasma concentration profile associated with the administration of several doses of a drug over time. It demonstrates the determinants of the fluctuation in the plasma concentrations, the accumulation of the drug over the course of therapy and the resting steady state plasma concentrations.
sim4045 runs, 24 downloads
Download Model
drug pharmacokinetics multiple doses multiple intravenous bolus injections
417.9
#32

Dosing regimen for renal failure

compare plasma concentration in renal failure, plan the dosing regimen in renal failure
sim3572 runs
Pharmacokinetics creatinine clearance Scr Clcr aminoglycoside
369.25
#33

Nonlinear Pharmacokinetics and Phenytoin

Nonlinear or capacity limited pharmacokinetics can occur whenever a process involved in the absorpti ... Read more
Nonlinear or capacity limited pharmacokinetics can occur whenever a process involved in the absorption, distribution or elimination of a drug becomes saturated. This model demonstrates nonlinear elimination (metabolism) using phenytoin as the model drug. Specifically, it demonstrates how increasing doses of the drug produce disproportionate increases in the plasma concentration. It also demonstrates how the model parameters, Km and Vmax influence of the plasma concentration -time profile.
sim3254 runs, 20 downloads
Download Model
nonlinear pharmacokinetics capacity limited elimination drug phenytoin
334
#34

White-Eyed Genetics

White-eyed is an allele that results in a fly white eyes. Wild-type variants have red eyes. The ... Read more
White-eyed is an allele that results in a fly white eyes. Wild-type variants have red eyes. The goal of this simulation is to determine the pattern of inheritance for the white-eyed phenotype. Is yellow body dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?
sim18626 runs
Genetics
326.9
#35

Multiple Oral Doses Pharmacokinetics

Most commonly people take oral doses of a drug over an extended period. This model demonstrates the ... Read more
Most commonly people take oral doses of a drug over an extended period. This model demonstrates the unique plasma concentration profile associated with this type of drug administration. The model assumes first-order drug absorption with no lag time. Simulations can be carried out to observe how the rate and extent of absorption (bioavailability) affect the profile.
sim3577 runs, 22 downloads
Download Model
multiple oral doses interactive pharmacokinetics drug bioavailability
324.35
#36

Change the dosing interval

interval & dosing, regularly or irregularly
sim2913 runs
Pharmacokinetics dosing interval irregular interval TMU Hara
301.35
#37

Phenology of the Karner Blue Butterfly

Karner Blue butterfly is an endangered species. Habitat loss and climate change are contributing fac ... Read more
Karner Blue butterfly is an endangered species. Habitat loss and climate change are contributing factors to the reduction in the butterflies' population sizes. Climate change can alter the timing of lifecycles. When climate change disproportionally affects the timing of life cycles of species in an ecosystem asynchrony within a food web occurs.
sim2755 runs
asynchrony timing phenology climate change butterfly
297.9
#38

Apterous Genetics

Apterous is an allele that results in a fly without wings. Wild-type variants have normally function ... Read more
Apterous is an allele that results in a fly without wings. Wild-type variants have normally functioning wings. The goal of this simulation is to determine the pattern of inheritance for the apterous phenotype. Is apterous dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?
sim59647 runs
Genetics
297.6
#39

Pharmacokinetics: An IV Injection on a Two Compartment Model

This model shows the profile of a drug after an intravenous injection when the drug displays two com ... Read more
This model shows the profile of a drug after an intravenous injection when the drug displays two compartment characteristics
sim3207 runs, 28 downloads
Download Model
durg pharmacokinetics IV two compartment model
283.05
#40

Understanding the Measles Outbreak

The current 2019 measles outbreak is the highest since the early '90s and is drawing much attention ... Read more
The current 2019 measles outbreak is the highest since the early '90s and is drawing much attention from the media and the public. This model walks investigates how measles spreads in a population and what policies work best for reducing that spread.
sim1984 runs, 24 downloads
Download Model
Measles vaccine infectious disease quarantine WOM
228.7
#41

The Power of The Missing Middle

Systems Thinking at Large takes a closer look at the suprising win for Trump. Focusing on the missi ... Read more
Systems Thinking at Large takes a closer look at the suprising win for Trump. Focusing on the missing middle population and their possible power in the voting booth.
sim1936 runs, 99 downloads
Download Model
Trump missing middle vicious cycle storytelling manufacturing jobs
227
#42

macrolab

macrolab
sim2173 runs
203.8
#43

Housing Supply and Demand

Use this learning lab to investigate the housing crisis. Play with interest rates as if you are Chai ... Read more
Use this learning lab to investigate the housing crisis. Play with interest rates as if you are Chairman of the Federal Reserve and see the impact on housing supply and demand. What happens when banks relax mortgage requirements and more people qualify to buy homes?
sim1457 runs, 203 downloads
Download Model
Modules finance debt economics housing demand
195.1
#44

Humanitarian Aid

A look at disaster relief under uncertain local government scenarios. It looks at how long it might ... Read more
A look at disaster relief under uncertain local government scenarios. It looks at how long it might take to establish clean water thru flying in bottled water and constructing wells. There is also the impact on spread of disease and survival due to lack of water. Created by Mark Heffernan and George McDonnel
sim1314 runs, 123 downloads
Download Model
Disaster relieft Water Mark Heffernan George McDonnel scenarios
175.1
#45

Beta Cell Simulation - Split story

sim1952 runs
172.4
#46

Limits to Growth Archetype

Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop I ... Read more
Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop Impact Method.
sim1398 runs, 110 downloads
Download Model
Loop dominance Limits to Growth archetype loop impact Hayward
172.35
#47

Sigmoidal Emax Model of Drug Response

This is the model that is most commonly used to for the time course of drug effects in man. It assum ... Read more
This is the model that is most commonly used to for the time course of drug effects in man. It assumes that the response is driven by the blood or plasma concentrations of the drug. When the model parameters are known, it can be used to predict response at anytime time after any dose.
sim1434 runs, 40 downloads
Download Model
Pharmacodynamic Drug Sigmoidal Emax Emax
171.55
#48

Multiple Intermittent Infusions Pharmacokinetics

The model shows the unique plasma concentration-time profile associated with the administration of a ... Read more
The model shows the unique plasma concentration-time profile associated with the administration of a drug using multiple short infusions. It demonstrates the influence of the duration of the infusion and allows the user to practice the calculation of a suitable dose and dosing interval to achieve desired peak and trough plasma concentrations of a drug.
sim1655 runs, 11 downloads
Download Model
Multiple intermittent infusions aminoglycoside infusion drug interactive pharmacokinetics
169.1
#49

Headcount Strategy

Explore a consulting firm’s headcount strategy. Understand the relationship between growth rates, pr ... Read more
Explore a consulting firm’s headcount strategy. Understand the relationship between growth rates, promotion times, headcount pyramid ratios, and attrition rates. This model is based on actual work that was done with a very well-known consulting company (here, code-named TWBC, Inc.). The firm's strategic goals were well-articulated, and each made sense when written down in a list on a piece of paper. However, when subjected to the more rigorous, dynamic scrutiny that an iThink modeling effort provides, the goals (as is too often the case) turned out to be in conflict with one another--stimulating actions that worked at cross-purposes. Efforts to achieve one goal drove the firm farther away from achieving the others. The subsequent analysis conducted with the model also pointed the way toward resolving the internal strategic inconsistencies and putting the firm back onto a strategically sound growth path.
sim1150 runs, 192 downloads
Download Model
Headcount employees growth manager consultant
168.8
#50

Dairy Cows

Agriculture offers many modeling opportunities. In this Systems in Focus, we look at the life cycle ... Read more
Agriculture offers many modeling opportunities. In this Systems in Focus, we look at the life cycle of a dairy herd, including milk production. This model could be used as the basis for methane production control, trade agreements about milk and how that impacts herd size, increasing production with demand, etc. Visit https://iseesystems.com/resources/systems-in-focus/agriculture/ for more information.
model1313 downloads
Download Model
Systems in Focus agriculture cows dairy
166.3
#51

Closed Loop

Mininimal closed-loop model of the cardiovascular system
sim44704 runs
162.8
#52

macrolab2017

sim4742 runs
161.5
#53

Urban Business Expansion

The business sector of the Three Stock Urban Dynamics model is examined using the Hayward/Boswell Lo ... Read more
The business sector of the Three Stock Urban Dynamics model is examined using the Hayward/Boswell Loop Impact Method.
sim1254 runs, 71 downloads
Download Model
Loop Dominance Limits to Growth Shifting loop dominance Urban Dyanmics Loop Impact
153.15
#54

Amalgamated Industries

sim1352 runs, 116 downloads
Download Model
142.4
#55

Choosing the Future

Users can run 3 long term scenarios for the Canadian economy featured in Managing without Growth (2n ... Read more
Users can run 3 long term scenarios for the Canadian economy featured in Managing without Growth (2nd edition) and create their own
sim1251 runs
economic growth post-growth no growth sustainable prosperity environment
139.65
#56

Evolving Bits

Diversity and selection for the basis of evolution. This simple model tries to illustrate these conc ... Read more
Diversity and selection for the basis of evolution. This simple model tries to illustrate these concepts.
sim1406 runs
Diversity Selection Evolution Receptor Antigen
139.35
#57

Evolution with Heterozygous Advantage

Evolution of Populations: Genetic Drift, Natural Selection, and Mutations
sim3305 runs
evolution natural selection genetic drift
134.85
#58

Simulator private

sim2644 runs
129.3
#59

Guns At School

This interface explores the public policy issue of gun violence at schools. As a policymaker, you c ... Read more
This interface explores the public policy issue of gun violence at schools. As a policymaker, you can explore different initiatives to see which are most effective at reducing this violence.
sim4883 runs
Guns Schools Public Policy Violence Bullying
126.85
#60

Automation

Innovation often raises concerns about job losses, increasingly so in the past century with widespre ... Read more
Innovation often raises concerns about job losses, increasingly so in the past century with widespread automation and advanced artificial intelligence. Should we start to fear for our job security or will the creative potential in society maintain the labor force? Explore this model to see some of the interesting possibilities!
sim824 runs, 123 downloads
Download Model
Automation job loss AI artificial intelligence labor force
126.75
#61

Growth Factors, Cyclins, and Cancer

Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (gro ... Read more
Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (growth factors), to stimulate the cell cycle feedback loops.
sim45230 runs
growth factors cyclins cell cycle cancer
118.85
#62

Kent CC Cohort Test

Kent CC Test Cohort Model - Jan 18 v 1.4.2
sim1990 runs
118.3
#63

The Laundry Detergent Game

Congratulations! You've just been hired by the major grocery chain The Price Shopper as head of mark ... Read more
Congratulations! You've just been hired by the major grocery chain The Price Shopper as head of marketing. Your job is to turn around The Price Shopper's dismal sales of laundry detergent. The big-wigs have given you 12 months and a marketing budget of up to $10,000 per month to spend as you please. They'll decide to keep you, or send you to the cleaners based on how much profit you bring in over the year. Do you think you can make the big MONEY?
sim792 runs, 58 downloads
Download Model
system dynamics bass diffusion model marketing
116
#64

Pierce County Homeless Response Model - In Testing

sim1320 runs
115.4
#65

Campus sexual assault

A very simple, one stock, simulation of campus sexist attitudes toward rape and initimate partner vi ... Read more
A very simple, one stock, simulation of campus sexist attitudes toward rape and initimate partner violence. The model was originally developed in 1998 and later translated into Stella. The model has a number of modeling errors, but at the time, proved useful for gaining insight into the dynamics of the system and developing an innovative prevention program.
sim931 runs, 32 downloads
Download Model
campus sexual assault community norms
115.3
#66

traffic congestion

Explores the dynamics of road use and road construction.
model995 downloads
Download Model
traffic urban planning congestion
112.3
#67

Catastrophic Regime Change in Aquatic Ecosystems

sim1423 runs
Ecology
111.1
#68

HPV and Adaptive Immune Response

sim4083 runs
HPV Antibodies feedback loops vaccine
110.9
#69

Weight Loss Sim

by Corne
This simulation gives the user the ability to specify their own current condition (weight, age, heig ... Read more
This simulation gives the user the ability to specify their own current condition (weight, age, height etc.), choose their exercise regime and eating plans. The simulator then gives a projection for the user's weight for the next year (at a weekly resolution). Please take note that most of the pictures are navigation buttons to different screens, so remember to click on the pictures. I have personally used this simulator to successfully lose more than 20 kg. Hope you find this as valuable as I did. Good luck with your weight journey!
sim1210 runs
Weight loss Health
108
#70

Lotka-Volterra Predator-Prey Model

Explore my favorite aspect of system dynamics and a historic example. The homeostasis generated by t ... Read more
Explore my favorite aspect of system dynamics and a historic example. The homeostasis generated by the interconnections of a negative feedback loop governs much of life.
sim1433 runs
negative feedback loop Lotka-Volterra homeostasis predator-prey
102.75
#71

Supply and demand model

Supply and demand model
sim662 runs, 169 downloads
Download Model
Supply demand model money stella
100.25
#72

Business Cycle Dynamics

Business cycles are a fact of life for many industries. Market demand peaks one year only to plummet ... Read more
Business cycles are a fact of life for many industries. Market demand peaks one year only to plummet a year or two later. In this case study of a semiconductor business, Henk Akkermans, Professor of Supply Network Dynamics at Tilburg University, explores different policy options for order handling, production planning and capacity management to reduce oscillation and improve system performance.
sim551 runs, 142 downloads
Download Model
supply chain semiconductor oscillation. production planning capacity management
100.15
#73

Story of the Month Reissue: Deficit

Examines the often-confused concepts of deficits versus surpluses and tax cuts versus tax rebates.
sim776 runs, 22 downloads
Download Model
tax cuts tax rebates deficit surplus social security
99.7
#74

Pulmonary Edema

This model predicts collection of fluid in the lungs.
sim13954 runs
96.35
#75

interface-tutorial-start

Starting model for interface building tutorial.
sim926 downloads
Download Model
92.95
#76

Airport Runway Capacity

Examine the implications of an increasing number of landing airplanes on a fixed capacity runway.
sim548 runs, 148 downloads
Download Model
Reengineering discrete modeling queues iThink process improvement
90.25
#77

Aquatic Trophic Productivity Model

The ATP model is a dynamic food web simulation model.
sim910 runs
food webs river restoration fish biomass
89.15
#78

Extended Agrarian Society (from Dynamic Systems)

This model is an extension of the Simple Agrarian Society model from Dynamic Systems. The extensions ... Read more
This model is an extension of the Simple Agrarian Society model from Dynamic Systems. The extensions are to add a CO2 cost to the industrialization, an impact of CO2 on global temperature, an impact of global temperature on drought frequency, and impact of drought on food production and an impact of global temperature on polar sea ice.
model522 downloads
Download Model
population agriculture industrialization climate ice sheet
89.1
#79

Tragedy of the commons

sim27 runs
88.7
#80

Stella Architect B.M. Sample

Este modelo es un primer intento de utilizar el "Business Canvas" desarrollado por Alexander Osterwa ... Read more
Este modelo es un primer intento de utilizar el "Business Canvas" desarrollado por Alexander Osterwalder e Yves Pigneur, para explicar su carácter sistémico mediante la simulación de un modelo de negocio genérico utilizando Stella Architect. El objetivo principal es mostrar el vínculo entre los conceptos del pensamiento sistémico y la práctica del "Systems Dynamics" con el ampliamente difundido "Business Canvas". En la narrativa utilizada para describir la construcción del diagrama "Stock & Flow", se denomina entre parentesis el tipo de componente (Stock, Flow, Converter, o Conector) correspondiente a los principales elementos del modelo de negocio. La simulación permite visualizar la naturaleza sistémica de un modelo de negocio representado mediante el "Business Canvas".
sim454 runs, 70 downloads
Download Model
Stella Architect Business Canvas Modelos de Negocios Alex Osterwalder Simulación
88.4
#81

Tryptophan Operon: A repressible system

sim13448 runs
87.8
#82

Indirect Effect Model 1

Some drugs do not directly produce the measured drug response. Instead they act upstream, and either ... Read more
Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model I can be used for drugs that inhibit the synthesis of the response variable. An example is warfarin which inhibits the synthesis of clotting factors.
sim672 runs, 10 downloads
Download Model
indirect effect warfarin inhibition of kin
86.25
#83

Model 21. Emax Model of Drug Response With an Effect Compartment

This model demonstrates how an effect compartment can be added to a pharmacokinetic model to accommo ... Read more
This model demonstrates how an effect compartment can be added to a pharmacokinetic model to accommodate a delay in drug response caused by a slow distribution of a drug to its site of action. The simulation also explains hysteresis
sim665 runs, 18 downloads
Download Model
Drug Hysteresis Effect Compartment Pharmacodynamics
83.7
#84

05 SEIR Full Interface

sim1336 runs
82.9
#85

Abastecimento de Água

Demanda de água gera novos investimentos em infraestrutura de abastecimento
diagram675 downloads
Download Model
demanda de água abastecimento urbano investimentos
81.25
#86

Energy Demand Lab

This simple model explores the demand dynamics for a state's energy usage. For three sectors (reside ... Read more
This simple model explores the demand dynamics for a state's energy usage. For three sectors (residential, industrial, and agricultural) you can adjust the size of initial user base, the growth rate for the number of users, and the rate for the change in demand per user.
sim356 runs, 167 downloads
Download Model
Energy residential industrial agricultural energy usage
81.05
#87

Irreversible Drug Effects - Proton Pump Inhibitors

Some drugs act by binding covalently to their receptors. As a result, the target is destroyed and it ... Read more
Some drugs act by binding covalently to their receptors. As a result, the target is destroyed and its function returns only when it has been replaced by newly synthesized product. The target may be a protein, DNA, an enzyme, or a cell at any stage of development. This model has been applied to the action of the proton pump inhibitors, which bind to and destroy the H+,K+-ATPase pumps in the parietal cells of the gastric mucosa. Normal proton secretion is restored only when the pumps are replaced by newly synthesized functioning pumps (i.e., the usual turnover time of the system).
sim494 runs, 6 downloads
Download Model
Pharmacodynamic Irreversible Drug Effects Proton Pump Inhibitors PPI Response Model
81
#88

Bathtub

Introducing modeling through the bathtub model
model681 downloads
Download Model
bathtub linear
80.4
#89

Guppy Evolution

sim3830 runs
evolution biology genes
79.7
#90

Bed capacity model

stcs
sim579 runs, 52 downloads
Download Model
Bed Capacity Model Whole Systems
77
#91

Tick Tock: The Biological Clock and Circadian Rhythm

Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circa ... Read more
Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circadian rhythm.
sim793 runs
circadian clock feedback loop
74.6
#92

SysQ

An Introduction to SysQ is our free interactive resource for building and applying Systemic Intellig ... Read more
An Introduction to SysQ is our free interactive resource for building and applying Systemic Intelligence (SysQ). By using this guide, practitioners of systems thinking and adaptive leadership will better understand why systemic intelligence is an essential leadership capacity and how to increase anyone's (or any team’s) ability to apply it. An Introduction to SysQ gives you rapid access to the full suite of systems thinking tools (including the SysQ Questions, trend graphs, archetypes, causal loop and stock & flow diagrams, and simulations) – including when and how to use each! And because the guide is browser based, it works on mobile devices! You can even embed it on your website. We believe you’ll find this resource so useful that you’ll decide it belongs in your browser’s favorite bookmarks! (Currently, it works best on Google applications and devices – Chrome and Android-based devices.)
sim585 runs
systems thinking system dynamics sysq resource guide
73.2
#93

Turchin’s Metaethnic Frontier Theory of Imperial Growth

A country builds its empire by attacking its neighbours and taking over both their land and their pe ... Read more
A country builds its empire by attacking its neighbours and taking over both their land and their people. The larger the empire becomes, the more resources they have available to take further territory by force. However the further they expand, the harder they find it to keep expanding due to the geographical and organisational logistics involved. Additionally the empire finds it harder to maintain social cooperation among its people, its asabiya.
sim284 runs, 55 downloads
Download Model
Turchin Empire Collapse Collins Geopolitical
69.9
#94

Salmon Life Cycle Simulator

sim674 runs
Pacific salmon life cycle modeling water temperature stream flow
69.4
#95

Magallanes ESP

En este simulador, Usted juega el papel del director de una planta de producción de la emtresa magal ... Read more
En este simulador, Usted juega el papel del director de una planta de producción de la emtresa magallanes. Debe manejar el personal de venta y la capacidad de producción de modo a obtener un crecimiento fuerte y sostenido de las ventas.
sim539 runs
Magallanes Sobrecrecimiento y colapso Martin Schaffernicht Universidad de Talca
68.6
#96
This model was copied from Emily Brzozowski: Educational outcomes in relation to resource allocatio ... Read more
This model was copied from Emily Brzozowski: Educational outcomes in relation to resource allocation
model468 downloads
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Education resources funding student achievement
66.85
#97

Inventory Workforce Model

Oscillations in an Inventory Workforce model are examined using the Hayward/Boswell Loop Impact Meth ... Read more
Oscillations in an Inventory Workforce model are examined using the Hayward/Boswell Loop Impact Method.
sim323 runs, 118 downloads
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Loop Impact Loop Impact Workforce Inventory Control Oscillations
63.75
#98

Dynaville

Dynaville simule l'évolution des habitants d'un territoire à un horizon de 10 ans (ménages, déplacem ... Read more
Dynaville simule l'évolution des habitants d'un territoire à un horizon de 10 ans (ménages, déplacements...), selon différents scénarios de logements, d'emplois et d'évolution de son attractivité.
sim969 runs
attractivité territoire habitants démographie politique de logements déplacements
62
#99

MM7-1_Fixit_Hatfields

Model Mysteries Chapter 7: Fix it Fun Base Model
model593 downloads
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Model Mysteries
61.85
#100

MM1-D1_Growing

Model Mysteries Chapter 1: Growing, Growing, Gone Model 3: Zombie Chickens Dare
model572 downloads
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Model Mysteries
61.25
#101

MM3-D3_Mind_the_Gap

Model Mysteries Chapter 3: Mind the Gap Dare 3
model587 downloads
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Model Mysteries
61.15
#102

mm7-2_Fixit_Hatfields_fixed

Model Mysteries Chapter 7: Fix it Fun Hatfields - Fixed
model582 downloads
Download Model
Model Mysteries
61.1
#103

Pattern with recessive single band

sim13714 runs
genetics
60.8
#104

01 SEIR Baseline Stock and Flow - ISAT290

Baseline stock and flow behavior for SEIR
sim718 runs
60.65
#105

Dodds Stella Modeling

a SICK model, YEET!
model394 downloads
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Swag Stella Artois Model Scott
60.35
#106

MacroLab 19LM

This is the 'Learning Mode' (LM) version of MacroLab 19. On the 'background page' there is also inf ... Read more
This is the 'Learning Mode' (LM) version of MacroLab 19. On the 'background page' there is also information about the 'Empirical Mode' (EM) version.
sim553 runs
Economics Education
59.95
#107

SAVi

sim1517 runs
59.1
#108

Service Call Center Dynamics

One organization in the service delivery business experienced a situation where the number of delive ... Read more
One organization in the service delivery business experienced a situation where the number of delivery requests increased dramatically due to a seasonal promotion. This increase in requests caused an overload on the service delivery staff by not only having more people requesting service, but also because the amount of time spent with each customer increased. This model is designed to describe why this occurred in a way that can be transferable to other service delivery organizations.
sim195 runs, 81 downloads
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discrete modeling queues conveyors cycle time
58.6
#109

MM1-2_Growing

Model Mysteries Chapter 1: Growing, Growing, Gone Model 2: Zombie Chickens
model547 downloads
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Model mysteries
58.5
#110

Kaibab Ecosystem Interface Guide 2019_02_25

sim729 runs
58.5
#111

Terrestrial Carbon Cycle

The model is suppose to help, learn and investigate the flow of carbon between the atmosphere and la ... Read more
The model is suppose to help, learn and investigate the flow of carbon between the atmosphere and land plants and soils through photosynthesis and respiration. The key questions we want to understand are: ● How does the plant fertilization feedback work? ● Are plants taking up a significant amount of the carbon humans are emitting? ● Can we solve the climate change problem by planting trees to take up our CO​2​?
model384 downloads
Download Model
58.4
#112

Model 20. DDI Drug-Drug Interactions - Pharmacodynamic

This model demonstrates the interaction between two agonists and allows the efficacy (Emax) of one t ... Read more
This model demonstrates the interaction between two agonists and allows the efficacy (Emax) of one to be varied
model426 downloads
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Drug Interactions Pharmacodynamic Partial Agonist
58.15
#113

Transit Compartment of Drug Action

Change image Submit your own comment on the simulation. Share Comment upgrade hosting plan d ... Read more
Change image Submit your own comment on the simulation. Share Comment upgrade hosting plan delete simulation Transit Compartment Model of Drug Response By Sara Rosenbaum Sim URL: https://forio.com/simulate/sarar/transit-compartment-model Sim access:Other authors can download source model Sim plan: Simulate Free Sim stats:This sim has been run 326 times. This simulation was uploaded to Forio Simulate with the isee NetSim software. More information can be found at iseesystems.com. Your Rating: 1 star2 star3 star4 star5 star Average Rating: rating(1) Click here to edit the description A delay in response to a drug can occur when it takes a long time for the drug’s initial effect to be translated into the final response (a long transduction process). The delayed response profile can be captured using a series of transit compartments.
sim315 runs, 22 downloads
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Pharmacodynamics Transit compartment Delayed drug action
58.1
#114

Tolerance-Nicotine- Hypothetical Antagonist

Tolerance may be defined as a process that results in a reduction in the response to a specific drug ... Read more
Tolerance may be defined as a process that results in a reduction in the response to a specific drug concentration following repeated drug exposure. One model for tolerance assumes that the drug produces a hypothetical metabolite that opposes its action.
sim413 runs, 10 downloads
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Tolerance Nicotine Hypothetical Antagonist
58.1
#115

Leg VS Asprin

ur leg, vs, some asprin
model367 downloads
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leg asprin fight title fight fight for title
57.85
#116

Bricks to Clicks

Experience the dynamics of making a business shift from traditional to e-commerce. Simulate differen ... Read more
Experience the dynamics of making a business shift from traditional to e-commerce. Simulate different scenarios for how you’ll allocate spending on marketing versus infrastructure. You will see one of the more common dynamics in making a business shift, what Systems Thinkers refer to as the "worse before better" dynamic. If initial investments are made in the infrastructure quality rather than in marketing, total customers will actually fall for awhile. But if increasing amounts are spent on marketing (once the infrastructure is in place) then total customers will begin to explode. And the transition becomes successful!
sim250 runs, 67 downloads
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retail strategy iThink
57.7
#117

mse-litsim

Modelo de Simulación de Escenarios MSE-LITSIM
sim813 runs
gestión áreas litorales eutrofización estuarios humedales
57.55
#118

Mammoth

feedback loop
diagram365 downloads
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m a m m o
57.15
#119

Educational Outcomes

Educational outcomes in relation to resource allocation
model392 downloads
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Education resources funding student achievement
56.95
#120

Tolerance- Precursor Pool Model

Tolerance may be defined as a process that results in a reduction in the response to a specific drug ... Read more
Tolerance may be defined as a process that results in a reduction in the response to a specific drug concentration following repeated drug exposure. Tolerance could occur if an endogenous compound that plays an essential role in the response chain becomes depleted during response. This model assumes the drug stimulates the production of a response variable which becomes then becomes depleted.
sim306 runs, 6 downloads
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Tolerance Pharmacodynamic precurosr pool depletion model
56.95
#121

Diagrama causal innovacion

by Randiel
diagrama para representar el ciclo de innovacion
diagram345 downloads
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innovacion empresa ciclo smart planeamiento
56.9
#122

MM-1-1_Growing_linear

Model Mysteries Chapter 1: Growing, Growing, Gone Model 1: Zombie Chickens
model530 downloads
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56.8
#123

Collins Theory of Geopolitics - Effect of War

The spread of an empire according to the theory of Randall Collins and equations of Peter Turchin
sim322 runs, 35 downloads
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war empire geopolitics collins turchin
56.45
#124

MM6-S2_Stuck_in_a_Rut

Model Mysteries Chapter 6: Stuck in a Rut Story 2
model538 downloads
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Model Mysteries
56.4
#125

Population

Sample population model with graph
model392 downloads
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beginner sample population model
55.9
#126

MM3-1_Mind_the_Gap

Model Mysteries Chapter 2: Mind the Gap Base Model
model531 downloads
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Model Mysteries
55.75
#127

leidy Montaño

estructuras de edades
model344 downloads
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m a t h i
55.45
#128

MM5-2_Disappeared_Part2

Model Mysteries Chapter 5: The Disappeared Part 2
model527 downloads
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Model Mysteries
55.3
#129

Wetland Forestland hydrology

Simulates multiple hydrological processes through a forestland and wetland on the Western Boreal Pla ... Read more
Simulates multiple hydrological processes through a forestland and wetland on the Western Boreal Plain, Canada
model347 downloads
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Precipitation Evaporation Infiltration Groundwater
55.2
#130

An Abundance of Hops

Is the hops imbalance in the craft beer maket a cause for concern for the industry?
sim335 runs, 10 downloads
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Supply chain hops beer surplus shortage
54.7
#131

The Leaky Bucket

Suppose we have a bucket sitting under a tap with water flowing into it at a constant rate. The buck ... Read more
Suppose we have a bucket sitting under a tap with water flowing into it at a constant rate. The bucket has a hole in the bottom, so water leaks out over time. The rate at which water flows out of the hole won't be constant because the water pressure at the bottom depends on the height of the water in the bucket. Therefore, if the bucket is nearly empty, only a trickle will escape, but if the bucket is full, the extra weight of the water will push the water out of the hole much faster. Also, if the hole is bigger, the water will flow out much faster. For this model, we're going to assume that the outflow rate is proportional to the volume of water in the bucket multiplied by the size of the whole: Out_flow = Volume_In_bucket * Size_of_hole
model346 downloads
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54.6
#132

Food System

Food
sim666 runs
54.6
#133

ab

by kateK
This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected b ... Read more
This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors
model386 downloads
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evaporation water water vapour
54.55
#134

Fun with Springs-LevelA

This simulation is part of the oscillations series from the Creative Learning Exchange, http://www.c ... Read more
This simulation is part of the oscillations series from the Creative Learning Exchange, http://www.clexchange.org/curriculum/complexsystems/oscillation/default.asp
sim406 runs, 1 download
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spring physics oscillation
54.55
#135

qq

by kateK
This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected b ... Read more
This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors
model386 downloads
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evaporation water water vapour
54.55
#136

Rocket Model

Rocket Model with Wind Resistance
model428 downloads
Download Model
rocket wind resistance physics
54.45
#137

Limited Enthusiasm Model of Church Growth

A model of the growth of the Christian Church in periods of religious revival. The growth mechanism ... Read more
A model of the growth of the Christian Church in periods of religious revival. The growth mechanism is similar to the spread of an infectious disease.
sim283 runs, 26 downloads
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Church growth Revival Religion Epidemiology Enthusiasts
54.4
#138

The Leaky Bucket

Suppose we have a bucket sitting under a tap, with water flowing into it at a constant rate. The buc ... Read more
Suppose we have a bucket sitting under a tap, with water flowing into it at a constant rate. The bucket has a hole in the bottom, so water leaks out over time. The rate at which water flows out of the hole will not be constant because the water pressure at the bottom depends on the height of the water in the bucket. Therefore if the bucket is full, the extra weight of the water will push the water out of the hole faster. Also if the hole is bigger the water will flow faster. For this model, we're going to assume that the outflow rate is proportional to the volume of the water in the bucket multiplied by the size of the hole.
model344 downloads
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54.4
#139

Consumo de agua

by esteban
Este modelo es sobre cuanto nos demoramos en la ducha y cuanto estamos gastando por dia.
model349 downloads
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agua consumo litros centimetros
54.35
#140

The Wolves of Yellowstone

Keystone species are defined as a plant or animal that plays a unique role in the way the ecosystem ... Read more
Keystone species are defined as a plant or animal that plays a unique role in the way the ecosystem functions. But what would happen if that species were removed? What ripple effects would be caused by the absence of this species? We can examine these questions by looking at the wolf population in Yellowstone National Park. Wolves once flourished in Yellowstone and its surrounding areas. However, soon after the area was settled, misperceptions caused by fear and hatred fueled a large extermination effort of the wolves. For nearly 70 years, wolves were absent from Yellowstone. During this time, the ecosystem changed and diminished until scientists realized the value of the wolves and reintroduced them to Yellowstone. This model, built in iThink, uses storytelling to understand the dynamics of this keystone species. What animals were affected by their presence or absence. See how wolves play a part in not only population control of their prey but other animals and even plants far down the trophic levels.
sim18 runs, 164 downloads
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Keystone species Wolves wolf Trees Aspen
54.2
#141

Lav kraftforpris

lav kraftforpris
model383 downloads
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kraftfor pris lav kapasitet
54.1
#142
trial test for STELLA
model330 downloads
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population birth birth rate death death rate
54.05
#143

Grit-Affect-Performance

by Raafat
A first attempt at conceptualizing the dynamic relationship between emotions and grit and their infl ... Read more
A first attempt at conceptualizing the dynamic relationship between emotions and grit and their influence on student performance in cyberlearning environments
model258 downloads
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learning support scaffold online science
53.7
#144
Model Mysteries Chapter 2: Energy Drink Mania Model 1: Basic Model
model501 downloads
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Model Mysteries
53.55
#145

BacterialGrowth

Yo listen up, here's the story About a little guy that lives in a blue world And all day and all n ... Read more
Yo listen up, here's the story About a little guy that lives in a blue world And all day and all night and everything he sees is just blue Like him, inside and outside Blue his house with a blue little window And a blue Corvette And everything is blue for him And himself and everybody around 'Cause he ain't got nobody to listen I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I have a blue house with a blue window Blue is the color of all that I wear Blue are the streets and all the trees are too I have a girlfriend and she is so blue Blue are the people here that walk around Blue like my Corvette, it's in and outside Blue are the words I say and what I think Blue are the feelings that live inside me I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I have a blue house with a blue window Blue is the color of all that I wear Blue are the streets and all the trees are too I have a girlfriend and she is so blue Blue are the people here that walk around Blue like my Corvette, it's in and outside Blue are the words I say and what I think Blue are the feelings that live inside me I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa
model332 downloads
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53.2
#146

Mammoth Game

Extinction of Mammoths
model317 downloads
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extinction mammoth birth death
52.8
#147

Multiple Retailer Supply Chain

Experience the dynamics of overshooting/undershooting inventory typical in the retail industry. Tour ... Read more
Experience the dynamics of overshooting/undershooting inventory typical in the retail industry. Tour this supply chain model to understand the structure from the factory through multiple retailers to the consumer.
sim128 runs, 134 downloads
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iThink inventory arrays conveyors supply chain
52.75
#148

Medical Resident VS Patients

Who will win? The not yet doctor, or the street duo who needs medicine but in a controlled fashion? ... Read more
Who will win? The not yet doctor, or the street duo who needs medicine but in a controlled fashion? Who will go home in this TITLE FIGHT? Who will stay in the hospital
model339 downloads
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fight IV Medicine
52.25
#149

ING DE LA INFORMACIÓN EMPRESARIAL

by Daniela
diagrama forrester de un parque industrial
model401 downloads
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forrester parque industrial
52.2
#150

Customer-Employee Satisfaction

Research shows a strong correlation between employee satisfaction and customer satisfaction. Underst ... Read more
Research shows a strong correlation between employee satisfaction and customer satisfaction. Understand the correlation through this model, which illustrates the causal relationship between the two.
sim200 runs, 116 downloads
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Customer satisfaction employee satisfaction human resourses
52.2
#151

mans not hot

man not hot
model365 downloads
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mans not hot
52.05
#152

Carbon Cycle Model

Model of Carbon Cycle
model406 downloads
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Carbon Cycle Environmental
51.65
#153

ER Simulation

ER Simulation
sim515 runs, 34 downloads
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SVG Animation; Discrete
51.55
#154

Velocidad Un Ferrari

Velocidad Un Ferrari se detiene en una luz roja. La luz se vuelve verde. El conductor pisa el aceler ... Read more
Velocidad Un Ferrari se detiene en una luz roja. La luz se vuelve verde. El conductor pisa el acelerador y el carro sale acelerado. Él deja el pie en el acelerador. El carro acelera a 5 millas por hora cada segundo. Pregunta: ¿Qué tan rápido ira el Ferrari 16 segundos después?
model377 downloads
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51.55
#155

The Bass Diffusion Model

it is a model for the adoption of a new technology, Given P as the potential adopters of the new tec ... Read more
it is a model for the adoption of a new technology, Given P as the potential adopters of the new technology, and A as the actual adopters, the adoption of new technology takes place due to two process - 1) word of mouth and 2) advertising and any other external influence. the adoption rate AR from potential adopters is AR= WoM + AfA
model344 downloads
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Technology Diffusion Model
51.1
#156

Stella project

Simulation showing how cyber attacks have grown in various years.
model375 downloads
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amount of attacks attacks per year increase rate of attacks
50.75
#157

Model 27. Hematological Toxicity of Anticancer Drugs

This model shows the typical effect of several anticancer drugs on the number of circulating neutrop ... Read more
This model shows the typical effect of several anticancer drugs on the number of circulating neutrophils. The drugs destroy neutrophils as they develop in the bone marrow, and its takes several days for their action to affect the circulating neutrophils. The model demonstrates how inter-individual variability in pharmacokinetics and pharmacodynamics can effect the magnitude and duration of this response.
sim235 runs, 11 downloads
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Neutropenia Hematological Toxicity Pharmacodynamic
50.6
#158

Evolving Bits N=40

sim1118 runs
evolution bits receptor substrate
50.3
#159

Animal Temperature

Explore the laws of thermodynamics with this animal temperature model. As you experiment, think abo ... Read more
Explore the laws of thermodynamics with this animal temperature model. As you experiment, think about animal adaptations and consider the following: What problems do small animals face compared to large animals in hot and cold environments? What problems do cold-blooded (poiklothermic) animals face compared to warm-blooded (homeothermic) animals? What is it that insulation really does for animals? The story behind this model is explained in a chapter of Tracing Connections
sim123 runs, 17 downloads
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Thermodynamcis adaptation poiklothermic homeothermic Warm-blooded
50
#160

Indirect Effect Model 2

Some drugs do not directly produce the measured drug response. Instead they act upstream, and either ... Read more
Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model 2 can be used for drugs that inhibit the degradation of the response variable. As a result they increase the amount of the response variable.
sim251 runs, 5 downloads
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Drug Inhibition of kout Indirect effect
49.95
#161

multiplayer-tutorial-start

This is the starting point for the help chapter on building a multiplayer game
sim471 downloads
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49
#162

Indirect Effect Model 4

Some drugs do not directly produce the measured drug response. Instead they act upstream, and either ... Read more
Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model IV can be used for drugs that stimulate the degradation of the response variable. As a result they decrease the amount of the response variable.
sim187 runs, 6 downloads
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Drug Pharmacodynamics Indirect Effect Model 4 Stimulation of kout
48
#163

Supply Chain-Collection Center of Tomato

The model was developed in a company of the Agri-food sector and considers the distribution link in ... Read more
The model was developed in a company of the Agri-food sector and considers the distribution link in the collection center of the Tomato Roma product for export to Rio Rico AZ, in 2017 by students of the Technological Institute of Sonora of the Department of Industrial Engineering.
model237 downloads
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supply chain collection center tomato
47.75
#164

Introduction to Systems Dynamic Modeling

by Will
Packet provided after interview
model409 downloads
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isb systems biology
47.45
#165

Community Model Building: Drought

In a pioneering attempt, isee systems hosted a Community Model Building webinar on Drought in Califo ... Read more
In a pioneering attempt, isee systems hosted a Community Model Building webinar on Drought in California, a severe and complex issue facing humanity. We discussed live with the community what the main problem variables are and how they change over time. We then built a qualitative model (causal loop diagram) based on participants' input. This quantitative model (stock and flow diagram) model was built in the background, representing the discussion.
sim85 runs, 28 downloads
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Community water drought climate science
47.1
#166

Spread of Disease

A simple SIR model is examined using the Hayward/Boswell Loop Impact Method.
sim205 runs, 68 downloads
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SIR Disease Infection Loop dominance loop impact
47.1
#167

MM4-1_Spreading

Model Mysteries Chapter 4: Spreading Like Crazy Base model
model439 downloads
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Model Mysteries
46.95
#168

Process with Complete Quality Control Feedback Mechanisms

This model depicts a process with exogenous inflows where the efficacy of the process descreases in ... Read more
This model depicts a process with exogenous inflows where the efficacy of the process descreases in proportion to time spent in the process. It is followed by a quality control mechanism with sensitivities and specificities which also decrease with time spent in the quality process. This bounded process and quality control is then checked against a gold standard which then adjusts as necessary in alignment with larger policy goals and feeds a larger data set. This model represents a realistic vision of what frontline quality control mechanisms should exist in the healthcare delivery system. It can be used as a tool for policy making to determine what acceptable rates of efficacy and outcome can be tolerated as quality based payments grow in popularity.
model69 downloads
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quality quality control quality based payments us healthcare policy rate dependent quality
46.9
#169

Integrated Population System

This model is a second extension of the Simple Agrarian model from Dynamic Systems that modifies the ... Read more
This model is a second extension of the Simple Agrarian model from Dynamic Systems that modifies the simple agrarian society model to include drought, industry produced CO2 and ice sheet dynamics. Primarily this is published as a test of porting from Stella 10.1 and learning how the new Stella Online operates. Several of the converter weights have been fine tuned to provide a better behaved model than the first adaptation. At some point a user interface and story will be added and the starting conditions calibrated to approximate treating Earth as an industrialized, agrarian society.
model67 downloads
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population agriculture industrialization climate ice sheet
46.7
#170

04 SEIR Interface Template

sim740 runs
46.6
#171

The Dynastic Cycle

The model of Feichtinger, Forst and Piccardi.
sim262 runs, 21 downloads
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History limit cycles social modeling psychology Hayward
46.55
#172

MM5-D3_Disappeared

Model Mysteries Chapter 5: The Disappeared Dare 3
model439 downloads
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Model Mysteries
46.5
#173

Supply Chain: Logistic Service Gas Station

This model was developed by Ernesto Vega and Ernesto Lagarda in 2017 for a Company AGM in Sonora Mex ... Read more
This model was developed by Ernesto Vega and Ernesto Lagarda in 2017 for a Company AGM in Sonora Mexico
model262 downloads
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supply chain logistic service gas station interface
46.35
#174

Energy (2002)

Can Energy Prices Really Be Passed on to the Consumer? Energy literally fuels every aspect of today' ... Read more
Can Energy Prices Really Be Passed on to the Consumer? Energy literally fuels every aspect of today's economy. When energy costs increase, many businesses will increase prices thereby "passing on" the cost to consumers. This story helps to explain some of the broader reaching impacts of such a policy. This model was created by Steve Peterson.
sim15 runs, 115 downloads
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Energy consumer energy prices power policy
46.35
#175

MM2-S3_Medicine

Model Mysteries Chapter 2: Energy Drink Mania Story 2: Medicine
model430 downloads
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Model Mysteries
46.3
#176

MM4-D3_Spreading

Model Mysteries Chapter 4: Spreading Like Crazy Dare 3
model431 downloads
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Model Mysteries
45.95
#177

Tesing Unknown Enzymes

sim2975 runs
enzymes
45.8
#178

Financial instability

by Crelis
Market-capitalism typically goes through cycles of expansion and contraction. Every now and then, th ... Read more
Market-capitalism typically goes through cycles of expansion and contraction. Every now and then, these common economic cycles go off the hinges. They become unstable and can lead to recessions, crises and depressions—phenomena that economists typically look to exogenous forces to explain. Alternative, mostly Marxian and Keynesian, explanations for the instabilities have been sought within the structure of the economic system itself. One such explanation is provided by Steve Keen in his Goodwin-Minsky model. The model effectively mimics the dynamics of key indicators prior to, during and after the 2007/08 crisis. However, the model is also over-specified, highly sensitive to initial conditions and therefore more difficult to convey. In line with George Box’s plea for parsimony, this paper presents a more straightforward version of Keen’s model that remains consistent with its fundamental behaviour. The model also illustrates the potential for further dialogue between Marxian economics and system dynamics.
model58 downloads
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Financial instability Karl Marx Richard Goodwin Hyman Minsky Steve Keen
45.8
#179

Salmon Simulator

Simulation of salmon populations with harvesting using the Tucannon River (WA) as an example. Simul ... Read more
Simulation of salmon populations with harvesting using the Tucannon River (WA) as an example. Simulation accompanies the text Modeling the Environment, 2nd ed. by Andrew Ford. Used with permission.
sim608 runs
salmon harvesting maximum sustainable yield
45.45
#180

SDGs Interactions, v2

This is the second version of the simulation that analyzes the interactions among the six Sustainabl ... Read more
This is the second version of the simulation that analyzes the interactions among the six Sustainable Development Goals (SDGs) that are the focus of the Second Annual Multi-stakeholder Forum on Science, Technology, and Innovation for the Sustainable Development Goals (STI Forum). The interface can be used to understand the trade-off due to the complex interplay among the set of six SDGs
sim129 runs, 22 downloads
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interconnections linkages interactions SDGs
45.25
#181

Factors affecting the rate of evaporation of water

To investigate how rate of evaporation of water is affected by different factors
model312 downloads
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evaporation water water vapour
45.2
#182

STELLA water model

Water supply
model293 downloads
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science project parklands college
44.9
#183

Overshoot and Collapse

Simple overshoot and collapse structure
model428 downloads
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Overshoot and collapse
44.75
#184

Le budget de la ville de Quimper

sim720 runs
Budget ville
44.3
#185

Resources and Population

model443 downloads
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44.3
#186
Model Mysteries Chapter 2: Energy Drink Mania Story 2: Sheep
model411 downloads
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Model Mysteries
44.25
#187

Ski Resort Dynamics

This practice field provides a risk-free environment for exploring different capacity expansion stra ... Read more
This practice field provides a risk-free environment for exploring different capacity expansion strategies for a ski resort. Apply the insights to a wide range of process improvement efforts.
sim236 runs, 49 downloads
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Conveyors reenginering cycle time. crowding
43.95
#188

SR interaction of slbo and trbl

by srrz63
Model of the interaction between Slbo and Trbl. C/EBP encoded by Slbo binds Trbl and is subsequently ... Read more
Model of the interaction between Slbo and Trbl. C/EBP encoded by Slbo binds Trbl and is subsequently tagged by uiquitination. This interaction also changes the function of the pseudokinase domain of Trbl. In result, Trbl becomes susceptible to small molecule binding and is degraded.
model147 downloads
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Tribbles Slbo Cebp drosophila
43.85
#189

H1N1 Flu Outbreak

What is most effective in controlling the outbreak of a flu virus in schools? Is it better to vaccin ... Read more
What is most effective in controlling the outbreak of a flu virus in schools? Is it better to vaccinate or stay home? Use this Learning Lab to understand how infectious disease spreads and why the World Health Organization signaled the 2009 H1N1 (also called “swine flu”) outbreak as a pandemic.
sim115 runs, 20 downloads
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Flu outbreak SIR model infections desease pandemic
43.8
#190

Test LSystem

Testmodell
sim563 runs
43.55
#191

Feebates

Model of fees and rebates for air pollution control based on differing vehicle types. Model orginal ... Read more
Model of fees and rebates for air pollution control based on differing vehicle types. Model orginally developed by Andrew Ford to accompany Modeling the Environment, 2nd Ed., Island Press (2010) . Used with permission.
sim591 runs
air pollution rebates
43.05
#192
Model Mysteries Chapter 2: Energy Drink Mania Story 1: Trees
model396 downloads
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Model Mysteries
42.75
#193

Resource Allocation

One of the most challenging tasks in most organizations is the allocation of headcount between time- ... Read more
One of the most challenging tasks in most organizations is the allocation of headcount between time-competing activities. In this model, you will have a chance to explore these sorts of dynamics in the context of a consulting firm, where the same headcount can be allocated to business development activities and client service delivery. You'll see the classic pattern of "Feast or Famine," or the so-called "pig in a snake," emerge.
sim123 runs, 96 downloads
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human resources headcount
42.6
#194

Indirect Effect Model 3

Some drugs do not directly produce the measured drug response. Instead they act upstream, and either ... Read more
Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model III can be used for drugs that stimulate the production of the response variable. As a result they increase the amount of the response variable.
sim126 runs, 10 downloads
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Drug Pharmacodynamics Indirect Effect Model 3 Stimulation of kin
42.5
#195

Business Model Stella Canvas

A sample of how Stella Architect can be used to simulate and create an interface using as reference ... Read more
A sample of how Stella Architect can be used to simulate and create an interface using as reference the Business Model Canvas developed by Osterwalder & Pigneur
sim147 runs, 38 downloads
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Stella Architect Business Canvas Business Mode Sytem Dynamics Simulation
42.4
#196

MM7-1_Fixit_Adopting

Model Mysteries Chapter 7: Fix it Fun Base model
model398 downloads
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Model Mysteries
42.35
#197

Draining structure

Draining generic structire
model253 downloads
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draining generic structure decay
41.6
#198

Fish Banks, Ltd.Game

by Saeed
In the Fish Banks, Ltd. game (originally developed as a board game by Professor Dennis L. Meadows in ... Read more
In the Fish Banks, Ltd. game (originally developed as a board game by Professor Dennis L. Meadows in 1986), teams of players manage their own fishing companies. At the beginning of the game, each fishing company has equal financial resources and fishing fleet. Each company has the same operating costs and technology. At the beginning of every simulated year, the companies make decisions about building, buying, and/or selling ships, whether to fish or not, and how far to send their fleet for fishing. The game's objective is to maximize total assets at the end of the simulation. The game developed here is a modified version of the Meadows' game as explained in the game rules.
sim152 runs
Dennis Meadows Fish Banks Natural Resources Management System Dynamics Tragedy of Commons
41.6
#199

Global Energy Balance and the Greenhouse Effect

The flows of light energy toward and away from the Earth. Energy comes in from sunlight, but some of ... Read more
The flows of light energy toward and away from the Earth. Energy comes in from sunlight, but some of its reflected back away from Earth, depending on the planet's albedo. The rest is absorbed by the Earth's surface and stored there. The Earth's surface gives infrared blackbody radiation according to the Stefan-Boltzmann law. A balance is reached when the inflowing solar energy exactly equals the outflowing infrared energy.
model212 downloads
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41.2
#200

Dynamic Modelling of Lionfish Invasion in the Caribbean Sea and Atlantic Ocean

The dynamic model shall explain the rapid diffusion of the lionfish - an invasive species - througho ... Read more
The dynamic model shall explain the rapid diffusion of the lionfish - an invasive species - throughout the Caribbean Sea and the Atlantic Ocean. The interface contains two explanatory models - a simple diffusion model and more realistic convection model - as well as a policy game to manage the regional countermeasures of local decision makers.
sim409 runs
lionfish invasion system dynamics caribbean
40.95
X

Sim App (Sim)

An interface that allows users to interact with a model.

Image of a sim

Sim apps allow users to interact with a model using buttons, sliders, knobs, tables, graphs, and storytelling. These interactions help users understand how parts of a system interact.

Interfaces are created by model authors in the Stella desktop software and can be uploaded to the isee Exchange.

Model

A diagram that represents how elements in a system influence one another.

Image of a model

Models are mathematical representations of how elements in a system are connected and interact (e.g., ecosystems, organizations, supply chains). When running models on the Exchange, results can be viewed in output devices like graphs and tables.

Models appear in the isee Exchange directory when authors upload them from the Stella® desktop software or create them with Stella Online™.

Causal Loop Diagram (CLD)

A map that represents the feedback structure of a system.

Image of a CLD

CLDs are high-level maps that represents the feedback structure of a system and easily communicate the essence of a model. They appear in the isee Exchange when authors upload them from the Stella desktop software or create them with Stella Online™.