Directory

The isee Directory is home to a variety of simulations published by our customers. You can search to see what is there by specifying by Title, Description, Keywords or Author. The default page lists a selection that may be of interest.

You can also log in to manage your own simulations or use Stella® Online to build models and CLDs.


We found 200 items

#1 - Lactase Enzyme Simulation with Data Analysis

by Jon Darkow - 792338 runs
Play

#2 - Photosynthesis Model

by Jon Darkow - 118529 runs
Play

#3 - Evolution and Natural Selection

by Jon Darkow - 84749 runs
Play

#4 - Population dynamics of white footed mouse

by Jon Darkow - 80919 runs
Play

#5 - Information Processing and Neurophysiology Model

by Jon Darkow - 67550 runs
Play

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.

#6 - Lac Operon with Monod Bump

by Jon Darkow - 33714 runs
Play

#7 - Evolution of LAP Allele in Mussels

by Jon Darkow - 24004 runs
Play

#8 - Lactase with Variable Sample Sizes

by Jon Darkow - 41352 runs
Play

Arrayed Lactase Model

#9 - Lactose Operon: An Inducible System

by Jon Darkow - 24907 runs
Play

In this simulation users explore the negative feedback system of the Lactose Operon found in bacteria. Lactose induces the system by inhibiting and inhibitor.

#10 - College Loans

by isee systems - 13889 runs - 297 downloads
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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.

#11 - Cellular Respiration Accounting Model

by Jon Darkow - 25521 runs
Play

The purpose of the model is to understand how glucose is metabolized, and how the energy stored in its chemical bonds is transfered.

#12 - Limiting Nutrients in Aquatic Ecosystems

by Jon Darkow - 16999 runs
Play

Experiment with a variety of nutrients that are limited by different degrees in four different ecosystems.

#13 - Water Potential and Osmosis

by Jon Darkow - 23224 runs
Play

Factors that affect the flow across a semi-permeable membrane.

#14 - Diffusion of a Spherical Cell

by Jon Darkow - 9660 runs
Play

Why are cells small? This model allows users to see how the size of a sphere affects the rate of diffusion.

#15 - Zombie Apocalypse

by isee systems - 8653 runs - 107 downloads
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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!

#16 - Oral Absorption

by Sara Rosenbaum - 8236 runs - 47 downloads
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This model is based on first order absoprtion in a 1-compartment model

#17 - Photosynthesis with Variable Sample Sizes

by Jon Darkow - 7595 runs - 21 downloads
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Sample sizes of Photosynthesis stocks in an array

#18 - Vacation

by isee systems - 7049 runs - 82 downloads
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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?

#19 - Administration routes

by Ichie Hara - 10802 runs
Play

observe three type of plasma concentration curve, and combine three of them

#20 - Thyroid Hormone - Negative Feedback

by Jon Darkow - 7399 runs
Play

#21 - Recombination and Gene Linkage

by Jon Darkow - 27386 runs
Play

#22 - Pharmacokinetics: An IV Injection in a 1-Compartment Model

by Sara Rosenbaum - 6365 runs - 42 downloads
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#23 - Transformation Simulation

by Jon Darkow - 8623 runs
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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.

#24 - Macromodel

by Pervin Dadashova - 5331 runs - 4 downloads
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Model for the public policy testing

#25 - Mulitple Bolus Injections Pharmacokinetics

by Sara Rosenbaum - 3829 runs - 23 downloads
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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.

#26 - Intravenous Infusion

by Sara Rosenbaum - 3931 runs - 17 downloads
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This model demonstrates the pharmacokinetic characteristics of constant continuous drug administration.

#27 - Dosing regimen for renal failure

by Ichie Hara - 3571 runs
Play

compare plasma concentration in renal failure, plan the dosing regimen in renal failure

#28 - White-Eyed Genetics

by Jon Darkow - 18538 runs
Play

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?

#29 - Multiple Oral Doses Pharmacokinetics

by Sara Rosenbaum - 2906 runs - 20 downloads
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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.

#30 - Nonlinear Pharmacokinetics and Phenytoin

by Sara Rosenbaum - 2972 runs - 15 downloads
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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.

#31 - Change the dosing interval

by Ichie Hara - 2912 runs
Play

interval & dosing, regularly or irregularly

#32 - Apterous Genetics

by Jon Darkow - 58573 runs
Play

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?

#33 - Extinction Vortex

by Jon Darkow - 5844 runs
Play

#34 - Pharmacokinetics: An IV Injection on a Two Compartment Model

by Sara Rosenbaum - 2536 runs - 27 downloads
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This model shows the profile of a drug after an intravenous injection when the drug displays two compartment characteristics

#35 - The Power of The Missing Middle

by isee systems - 1747 runs - 71 downloads
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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.

#36 - macrolab

by David Wheat - 2172 runs
Play

macrolab

#37 - Multiple Intermittent Infusions Pharmacokinetics

by Sara Rosenbaum - 1393 runs - 9 downloads
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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.

#38 - Closed Loop

by Christopher Quick - 44686 runs
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Mininimal closed-loop model of the cardiovascular system

#39 - Limits to Growth Archetype

by John Hayward - 1314 runs - 103 downloads
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Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop Impact Method.

#40 - Steady State in Freshwater Ecosystems

by Jon Darkow - 12300 runs
Play

#41 - macrolab2017

by David Wheat - 4741 runs
Play

#42 - Urban Business Expansion

by John Hayward - 1219 runs - 65 downloads
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The business sector of the Three Stock Urban Dynamics model is examined using the Hayward/Boswell Loop Impact Method.

#43 - Headcount Strategy

by isee systems - 992 runs - 153 downloads
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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.

#44 - Humanitarian Aid

by isee systems - 1113 runs - 69 downloads
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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

#45 - Sigmoidal Emax Model of Drug Response

by Sara Rosenbaum - 1333 runs - 38 downloads
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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.

#46 - Evolving Bits

by Jon Darkow - 1400 runs
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Diversity and selection for the basis of evolution. This simple model tries to illustrate these concepts.

#47 - Housing Supply and Demand

by isee systems - 960 runs - 140 downloads
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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?

#48 - Evolution with Heterozygous Advantage

by Jon Darkow - 3269 runs
Play

Evolution of Populations: Genetic Drift, Natural Selection, and Mutations

#49 - Amalgamated Industries

by isee systems - 1273 runs - 97 downloads
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#50 - Simulator private

by Camilo Benitez - 2637 runs
Play

#51 - Guns At School

by isee systems - 4719 runs
Play

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.

#52 - Dairy Cows

by isee systems - 864 downloads
View

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.

#53 - Growth Factors, Cyclins, and Cancer

by Jon Darkow - 45031 runs
Play

Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (growth factors), to stimulate the cell cycle feedback loops.

#54 - Kent CC Cohort Test

by Whole Systems Partnership - 1816 runs
Play

Kent CC Test Cohort Model - Jan 18 v 1.4.2

#55 - The Laundry Detergent Game

by Billy Schoenberg - 779 runs - 55 downloads
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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?

#56 - Campus sexual assault

by Peter Hovmand - 900 runs - 29 downloads
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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.

#57 - HPV and Adaptive Immune Response

by Jon Darkow - 4058 runs
Play

#58 - Weight Loss Sim

by Corne - 1136 runs
Play

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!

#59 - Automation

by isee systems - 613 runs - 78 downloads
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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!

#60 - Story of the Month Reissue: Deficit

by isee systems - 755 runs - 13 downloads
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Examines the often-confused concepts of deficits versus surpluses and tax cuts versus tax rebates.

#61 - Pulmonary Edema

by Christopher Quick - 13946 runs
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This model predicts collection of fluid in the lungs.

#62 - Supply and demand model

by Yaroslav Vorobiov - 612 runs - 158 downloads
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Supply and demand model

#63 - Tragedy of the commons

by Billy Schoenberg - 27 runs
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#64 - Tryptophan Operon: A repressible system

by Jon Darkow - 12823 runs
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#65 - Stella Architect B.M. Sample

by Armando Izquierdo - 448 runs - 61 downloads
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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".

#66 - 05 SEIR Full Interface

by Michael L Deaton - 1093 runs
Play

#67 - Guppy Evolution

by Jon Darkow - 3589 runs
Play

#68 - Indirect Effect Model 1

by Sara Rosenbaum - 574 runs - 8 downloads
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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.

#69 - Irreversible Drug Effects - Proton Pump Inhibitors

by Sara Rosenbaum - 481 runs - 3 downloads
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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).

#70 - Extended Agrarian Society (from Dynamic Systems)

by Paul Fisher - 402 downloads
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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.

#71 - interface-tutorial-start

by documentation - 764 downloads
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Starting model for interface building tutorial.

#72 - Circadian Clock in the Mouse

by Jon Darkow - 8756 runs
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Transcriptional Translational Feedback Loop in the Mouse

#73 - Aquatic Trophic Productivity Model

by Ryan Bellmore - 853 runs
Play

The ATP model is a dynamic food web simulation model.

#74 - Model 21. Emax Model of Drug Response With an Effect Compartment

by Sara Rosenbaum - 514 runs - 14 downloads
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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

#75 - Tick Tock: The Biological Clock and Circadian Rhythm

by Jon Darkow - 791 runs
Play

Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circadian rhythm.

#77 - SysQ

by Pontifex - 568 runs
Play

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.)

#78 - Business Cycle Dynamics

by isee systems - 324 runs - 94 downloads
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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.

#79 - Bathtub

by Anne Gallagher - 596 downloads
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Introducing modeling through the bathtub model

#80 - Turchin’s Metaethnic Frontier Theory of Imperial Growth

by John Hayward - 280 runs - 51 downloads
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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.

#81 - Energy Demand Lab

by isee systems - 279 runs - 117 downloads
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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.

#82 - Abastecimento de Água

by Mariana Lago - 551 downloads
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Demanda de água gera novos investimentos em infraestrutura de abastecimento

#83 - traffic congestion

by isee systems - 542 downloads
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Explores the dynamics of road use and road construction.

#84 - Overshoot and Collapse For ISAT 420

by Rod MacDonald - 567 runs - 18 downloads
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Simple Overshoot and Collapse Model

#85 - Dynaville

by Valerie Gacogne - 946 runs
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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.

#86 - Inventory Workforce Model

by John Hayward - 289 runs - 114 downloads
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Oscillations in an Inventory Workforce model are examined using the Hayward/Boswell Loop Impact Method.

#87 - Pattern with recessive single band

by Jon Darkow - 13630 runs
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#88 - 01 SEIR Baseline Stock and Flow - ISAT290

by Michael L Deaton - 706 runs
Play

Baseline stock and flow behavior for SEIR

#89 - Choosing the Future

by Peter Victor - 683 runs
Play

Users can run 3 long term scenarios for the Canadian economy featured in Managing without Growth (2nd edition) and create their own

#90 - SAVi

by Andrea Bassi - 1029 runs
Play

#91 - my new model

by Creative Learning Exchange - 389 downloads
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This model was copied from Emily Brzozowski: Educational outcomes in relation to resource allocation

#92 - Kaibab Ecosystem Interface Guide 2019_02_25

by Michael L Deaton - 728 runs
Play

#93 - Transit Compartment of Drug Action

by Sara Rosenbaum - 299 runs - 21 downloads
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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.

#94 - mse-litsim

by Lorenzo Andrade - 811 runs
Play

Modelo de Simulación de Escenarios MSE-LITSIM

#95 - Phenology of the Karner Blue Butterfly

by Jon Darkow - 2196 runs
Play

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.

#96 - Collins Theory of Geopolitics - Effect of War

by John Hayward - 314 runs - 31 downloads
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The spread of an empire according to the theory of Randall Collins and equations of Peter Turchin

#97 - Tolerance-Nicotine- Hypothetical Antagonist

by Sara Rosenbaum - 372 runs - 7 downloads
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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.

#98 - Airport Runway Capacity

by isee systems - 470 runs - 115 downloads
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Examine the implications of an increasing number of landing airplanes on a fixed capacity runway.

#99 - Bricks to Clicks

by isee systems - 223 runs - 60 downloads
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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!

#100 - Dodds Stella Modeling

by Henry Dodds - 315 downloads
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a SICK model, YEET!

#101 - Tolerance- Precursor Pool Model

by Sara Rosenbaum - 292 runs - 5 downloads
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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.

#102 - Evolving Bits N=40

by Jon Darkow - 1065 runs
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#103 - Model 27. Hematological Toxicity of Anticancer Drugs

by Sara Rosenbaum - 233 runs - 10 downloads
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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.

#104 - MM1-2_Growing

by Creative Learning Exchange - 460 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 2: Zombie Chickens

#105 - Indirect Effect Model 2

by Sara Rosenbaum - 250 runs - 3 downloads
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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.

#106 - Model 20. DDI Drug-Drug Interactions - Pharmacodynamic

by Sara Rosenbaum - 341 downloads
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This model demonstrates the interaction between two agonists and allows the efficacy (Emax) of one to be varied

#107 - Limited Enthusiasm Model of Church Growth

by John Hayward - 229 runs - 25 downloads
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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.

#108 - Educational Outcomes

by Emily Brzozowski - 308 downloads
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Educational outcomes in relation to resource allocation

#109 - Service Call Center Dynamics

by isee systems - 144 runs - 50 downloads
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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.

#110 - Multiple Retailer Supply Chain

by isee systems - 112 runs - 105 downloads
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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.

#111 - MM-1-1_Growing_linear

by Creative Learning Exchange - 443 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 1: Zombie Chickens

#112 - Indirect Effect Model 4

by Sara Rosenbaum - 179 runs - 6 downloads
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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.

#113 - Diagrama causal innovacion

by Randiel - 256 downloads
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diagrama para representar el ciclo de innovacion

#114 - Mammoth

by victor melendez - 271 downloads
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feedback loop

m a m m o t h

#115 - The Wolves of Yellowstone

by isee systems - 16 runs - 95 downloads
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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.

#116 - The Leaky Bucket

by Larissa M. Ramos - 270 downloads
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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

#117 - Population

by Billy Schoenberg - 302 downloads
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Sample population model with graph

#118 - qq

by kateK - 309 downloads
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This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors

#119 - 04 SEIR Interface Template

by Michael L Deaton - 738 runs
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#120 - The Leaky Bucket

by Jen Loveland-Rose - 263 downloads
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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.

#121 - ab

by kateK - 300 downloads
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This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors

#122 - Tesing Unknown Enzymes

by Jon Darkow - 2856 runs
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#123 - Trial

by Kirsten Gail Miaga - 247 downloads
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#124 - Salmon Simulator

by James Pratt - 603 runs
Play

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.

#125 - The Dynastic Cycle

by John Hayward - 253 runs - 18 downloads
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The model of Feichtinger, Forst and Piccardi.

#126 - Customer-Employee Satisfaction

by isee systems - 149 runs - 95 downloads
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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.

#127 - BacterialGrowth

by Daniel Edward McMahon - 251 downloads
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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

#128 - Mammoth Game

by Johanna Lockhart - 240 downloads
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Extinction of Mammoths

#129 - mans not hot

by clemente - 292 downloads
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man not hot

#130 - Process with Complete Quality Control Feedback Mechanisms

by Anthony Dowidowicz - 47 downloads
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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.

#131 - Le budget de la ville de Quimper

by Valerie Gacogne - 708 runs
Play

#132 - ING DE LA INFORMACIÓN EMPRESARIAL

by Daniela - 318 downloads
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diagrama forrester de un parque industrial

#133 - Energy (2002)

by isee systems - 14 runs - 91 downloads
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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.

#134 - SDGs Interactions, v2

by Dave Zelinka - 115 runs - 19 downloads
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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

#135 - Velocidad Un Ferrari

by Patricio javier Mackay - 297 downloads
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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?

#136 - Test LSystem

by Bernt Saxin - 563 runs
Play

Testmodell

#137 - Stella project

by Julianne Bantayan - 298 downloads
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Simulation showing how cyber attacks have grown in various years.

#138 - Carbon Cycle Model

by Henry Dodds - 320 downloads
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Model of Carbon Cycle

#139 - Feebates

by James Pratt - 591 runs
Play

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.

#140 - The Bass Diffusion Model

by Akshit Shah - 261 downloads
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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

#141 - Indirect Effect Model 3

by Sara Rosenbaum - 120 runs - 10 downloads
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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.

#142 - Integrated Population System

by Paul Fisher - 22 downloads
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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.

#143 - Introduction to Systems Dynamic Modeling

by Will - 352 downloads
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Packet provided after interview

#144 - Supply Chain-Collection Center of Tomato

by ernesto lagarda - 176 downloads
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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.

#145 - Fish Banks, Ltd.Game

by Saeed - 151 runs
Play

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.

#146 - Spread of Disease

by John Hayward - 159 runs - 59 downloads
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A simple SIR model is examined using the Hayward/Boswell Loop Impact Method.

#147 - MM2-1_Energy

by Creative Learning Exchange - 378 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Model 1: Basic Model

#148 - Financial instability

by Crelis - 12 downloads
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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.

#149 - Business Model Stella Canvas

by Armando Izquierdo - 142 runs - 35 downloads
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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

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

by Gian Wieck - 323 runs
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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.

#151 - Emergency Room

by Billy Schoenberg - 296 runs
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This simulation shows the basic dynamics of a hospital emergency room. Patients arrive, are treated and leave. You are able to control the average arrivial rate and average treatment time. This simulation was made using the 3rd party developer API embedded within Stella Architect.

#152 - Community Model Building: Drought

by isee systems - 25 runs - 14 downloads
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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.

#153 - Product Development Simulator

by Billy Schoenberg - 692 runs
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The Bass Model or Bass Diffusion Model was developed by Frank Bass and it consists of a simple differential equation that describes the process of how new products get adopted in a population. The model presents a rationale of how current adopters and potential adopters of a new product interact.

#154 - Predator-Prey-LevelA

by Creative Learning Exchange - 52 runs - 10 downloads
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Level A: Up and Down in the Wild: Predator and Prey This lesson allows students to explore the interactions of two animal populations (wolves and moose) within an ecosystem. One animal in the simulation is a predator. The other animal is its prey. Their populations rise and fall (oscillate) over time as they interact and impact one another.

#155 - STELLA water model

by Armelita - 238 downloads
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#156 - Factors affecting the rate of evaporation of water

by Anne Wong - 253 downloads
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To investigate how rate of evaporation of water is affected by different factors

#157 - multiplayer-tutorial-start

by documentation - 368 downloads
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This is the starting point for the help chapter on building a multiplayer game

#158 - Animal Temperature

by isee systems - 31 runs - 7 downloads
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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

#159 - Shane Goodwin - Carbon Levels

by Shane Goodwin - 153 downloads
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I'm doing this because I want to. Not because Deke told me to.

#160 - MM5-D3_Disappeared

by Creative Learning Exchange - 355 downloads
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Model Mysteries Chapter 5: The Disappeared Dare 3

#161 - MNH Strategic Model

by Peter Hovmand - 737 runs
Play

Strategic model of country-level policies to reduce maternal and neonatal mortality.

#162 - Demographic Fiscal Model of State

by John Hayward - 28 runs - 26 downloads
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An agrarian population can exceed its normal carrying capacity by the formation of a state that helps improve land productivity. As the population and state grow, it becomes harder for state revenue to stay ahead of expenditure. Eventually the state runs out of money and collapses, with a large drop in population numbers.

#163 - MM4-1_Spreading

by Creative Learning Exchange - 345 downloads
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Model Mysteries Chapter 4: Spreading Like Crazy Base model

#164 - Global Energy Balance and the Greenhouse Effect

by Ashley McCloud - 173 downloads
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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.

#165 - Supply Chain: Logistic Service Gas Station

by ernesto lagarda - 171 downloads
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This model was developed by Ernesto Vega and Ernesto Lagarda in 2017 for a Company AGM in Sonora Mexico

#166 - MM2-S3_Medicine

by Creative Learning Exchange - 339 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Story 2: Medicine

#167 - Housing Interventions to Improve Child Welfare Outcomes

by Social System Design Lab - 255 runs - 5 downloads
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#168 - Resource Allocation

by isee systems - 95 runs - 64 downloads
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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.

#169 - MM4-D3_Spreading

by Creative Learning Exchange - 338 downloads
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Model Mysteries Chapter 4: Spreading Like Crazy Dare 3

#170 - Ski Resort Dynamics

by isee systems - 189 runs - 33 downloads
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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.

#171 - DaisyWorld

by James Pratt - 407 runs
Play

Game model of Daisyworld. Model orginally developed by Andrew Ford to accompany Modeling the Environment, 2nd Ed., Island Press (2010) . Used with permission.

#172 - Cash for Clunkers

by isee systems - 5 runs - 4 downloads
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On July 24th, 2009 the Car Allowance Rebate System (CARS), commonly known as "Cash for Clunkers," began processing rebate claims. The $1 billion appropriated for the system was exhausted just SIX days later. This simulation explores an alternative program that is self-sustaining AND reduces automobile emissions. Using a combination of fees and rebates this program can finance itself (no emergency appropriations from Congress), reduce gasoline consumption (putting cash back in consumer's pockets), AND contribute to cleaner air for us all!

#173 - SR interaction of slbo and trbl

by srrz63 - 72 downloads
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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.

#174 - Modelo TOC

by Gabriela Silva Vizguerra - 208 downloads
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Simulación de un modelo para aumentar la capacidad de un proceso mediante la explotación de una restricción.

#175 - MM2-S2_Sheep

by Creative Learning Exchange - 329 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Story 2: Sheep

#176 - SanteDentaire

by Valerie Gacogne - 1409 runs
Play

#177 - MM1-D1_Growing

by Creative Learning Exchange - 317 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 3: Zombie Chickens Dare

#178 - Leg VS Asprin

by Abbey McDonald - 146 downloads
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#179 - MM7-1_Fixit_Hatfields

by Creative Learning Exchange - 330 downloads
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Model Mysteries Chapter 7: Fix it Fun Base Model

#180 - MM3-D3_Mind_the_Gap

by Creative Learning Exchange - 331 downloads
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Model Mysteries Chapter 3: Mind the Gap Dare 3

#181 - mm7-2_Fixit_Hatfields_fixed

by Creative Learning Exchange - 325 downloads
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Model Mysteries Chapter 7: Fix it Fun Hatfields - Fixed

#182 - Grit-Affect-Performance

by Raafat - 74 downloads
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A first attempt at conceptualizing the dynamic relationship between emotions and grit and their influence on student performance in cyberlearning environments

#183 - Consumo de agua

by esteban - 157 downloads
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Este modelo es sobre cuanto nos demoramos en la ducha y cuanto estamos gastando por dia.

#184 - Draining structure

by isee systems - 188 downloads
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Draining generic structire

#185 - Wetland Forestland hydrology

by Sam Probert - 146 downloads
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Simulates multiple hydrological processes through a forestland and wetland on the Western Boreal Plain, Canada

#186 - Terrestrial Carbon Cycle

by Ashley McCloud - 149 downloads
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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​?

#187 - Collins Theory of Geopolitics - Logistical Load

by John Hayward - 65 runs - 29 downloads
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The spread of an empire according to the theory of Randall Collins and equations of Peter Turchin. Includes limits to growth due the distance beween the empire's expansion zone and centre.

#188 - Rocket Model

by Christopher DiCarlo - 230 downloads
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Rocket Model with Wind Resistance

#189 - President & Prime Minister

by isee systems - 72 runs - 20 downloads
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Whose coffee cools faster? This question quickly becomes relevant for the president and the prime minister as they travel together in a plane. Understand the cooling process. Then experiment with a cooling model.

#190 - leidy Montaño

by Leidy Natalia - 132 downloads
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estructuras de edades

m a t h i a s

#191 - Romeo and Juliet-LevelB

by Creative Learning Exchange - 68 runs - 17 downloads
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Students use a simple simulation to explore "what if" questions relating to characters. They can change how characters behave to consider whether a story might have emerged differently. Note that students do not need to read the play, The Tragedy of Romeo and Juliet in order to explore the simulation.

#192 - Lav kraftforpris

by Culti Visus - 182 downloads
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lav kraftforpris

#193 - MM6-S2_Stuck_in_a_Rut

by Creative Learning Exchange - 313 downloads
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Model Mysteries Chapter 6: Stuck in a Rut Story 2

#194 - A Simple Example of System Dynamics Modeling

by Saeed Langarudi - 152 runs
Play

This is a simple, working example of system dynamics model which was used as a supporting material in my seminar in "What is System Dynamics?" on Feb 24th at Water Resources Research Institute, New Mexico State University.

#195 - MM3-1_Mind_the_Gap

by Creative Learning Exchange - 311 downloads
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Model Mysteries Chapter 2: Mind the Gap Base Model

#196 - MM5-2_Disappeared_Part2

by Creative Learning Exchange - 309 downloads
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Model Mysteries Chapter 5: The Disappeared Part 2

#197 - Medical Resident VS Patients

by Abbey McDonald - 151 downloads
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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

#198 - ResiMod v.2.5

by Jai Clifford-Holmes - 469 runs
Play

ResiMod was developed by the Association for Water and Rural Development (AWARD), a South African non-profit organisation, with partners. The underlying work was funded by the United States Agency for International Development, under a USAID Southern Africa grant – RFA-674-12-000016 RESilience in the LIMpopo Basin Program (RESILIM). The RESILIM-O part of the programme is implemented by AWARD, in association with project partners.

#199 - Crop Selection Dynamics

by Saeed Langarudi - 153 runs
Play

This model replicates dynamics of crop selection in an agricultural system in which there are two groups of farmers: upstream and downstream. Upstream farmers have immediate access to surface water but downstream farmers can use surface water that is remaining after upstream use. Both groups of farmers grow two types of crops. Crop characteristics as well as other assumptions of the model could be changed by model users. Different scenarios for water availability are also available to the users.

#200 - Gone with the Wind

by John Hayward - 69 runs - 13 downloads
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The loop impact method of Hayward/Boswell is applied to a single second order balancing loop using the narrative of the love relationship between Rhett and Scarlet from Gone with the Wind.