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Number of items: 98
Date joined: Jun 01 2016

isee systems's Work

#1

Goal Seeking

sim295 runs
#2

Amalgamated Industries

sim4651 runs, 272 downloads
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#3

External Resource

sim115 runs
#4

Enron

sim321 runs
Business
#5

Draining

sim152 runs
#6

Compounding

sim140 runs
#7

Microchips and the Auto Industry

After 2 years unreliable supply chain of microchips, the auto industry is struggling to adopt.
sim1532 runs, 100 downloads
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Business Economics Education
#8

The Balloon Problem

This model illustrates how a simple interface can facilitate experimentation with a mathematics mode ... Read more
This model illustrates how a simple interface can facilitate experimentation with a mathematics model. The model depicts a classic problem in calculus known as the balloon problem. Experiment with different distances and velocities.
sim393 runs, 99 downloads
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Calculus relates rates Pythagorean Theorem Balloon distance
#9

Dual Flow

sim139 runs
#10

Temperatures

Simulation showing min, max and average temperatures in the United States by month.
sim975 runs, 219 downloads
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Yearly temperature; svg animation
#11

Interfaces in Stella Architect

Example interface features in Stella Architect in a mouse population simulation
sim1431 runs
Biology Ecology Interface; Capacity Contraint; Population
#12

Mystery on the Island of Borneo

What do the bubonic plague, falling roof beams and dead fish have in common? Read this story and unf ... Read more
What do the bubonic plague, falling roof beams and dead fish have in common? Read this story and unfurl the STELLA model to solve the mystery.
sim9 runs, 186 downloads
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Borneo mystery cats DDT Geckos
#13

Supply Chain Dynamics

Use this model to explore the implications of supplier, producer, and consumer attributes on overall ... Read more
Use this model to explore the implications of supplier, producer, and consumer attributes on overall supply chain performance.
sim2113 runs, 630 downloads
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Supply Chain inventory main chain reengineering
#14

ER Simulation

ER Simulation
sim1089 runs, 237 downloads
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SVG Animation; Discrete
#15

Airport Runway Capacity

Examine the implications of an increasing number of landing airplanes on a fixed capacity runway.
sim1829 runs, 427 downloads
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Reengineering discrete modeling queues iThink process improvement
#16

Natural Selection Pressure

In this model, a rabbit population comes under a natural selective pressure from a fox population. T ... Read more
In this model, a rabbit population comes under a natural selective pressure from a fox population. The average speed of the rabbit population increases as a result. You can experiment with the strength of the natural selective force.
sim1056 runs, 255 downloads
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Biology predator-prey
#17

COVID-19: Vertical Isolation in Brazil

Does the policy of vertical isolation allow a country to reopen its businesses and schools without i ... Read more
Does the policy of vertical isolation allow a country to reopen its businesses and schools without increasing COVID-19 cases or deaths? This simulator explores the outcomes of horizontal isolation (what we're doing now) and vertical isolation (only isolate the sick and the elderly).
sim4571 runs
Biology Science Education COVID-19 coronavirus
#18

Plant Succession

This simulation illustrates how plants in the ecosystems move throught the successional stages of fo ... Read more
This simulation illustrates how plants in the ecosystems move throught the successional stages of forb, grass, shrub, pine and hardwood. Plants in each stage build soil quality, thereby creating conditions for the development of the subsequent stage. As a stage establishes a sufficient presence in the ecosystem, it crowds out the previous stage.
sim191 runs
Environment Biology Science Ecology
#19

Success to the Successful

In the "Success to the Successful" archetype the behavior pattern created is a widening gap betwee ... Read more
In the "Success to the Successful" archetype the behavior pattern created is a widening gap between the successful and the unsuccessful. Understanding the structure of the system helps us to see that the reasons for this gap aren't necessarily about competence. In other words, winners aren't always the best - it is often the structure that determines who wins. By understanding how the system works, we can avoid falling into the trap of a win-lose situation and work to create a win-win environment.
sim139 runs
Archetype
#20

Optimization Example

Demonstrates the use of optimization on the interface.
sim
Optimization
#21

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.
sim343 runs, 172 downloads
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Community water drought climate science
#22

Temperature Control

Conduct experiments and try to maintain a constant temperature in a house that uses a climate contro ... Read more
Conduct experiments and try to maintain a constant temperature in a house that uses a climate control system. Turn on and off the Proportional and Integral controllers that drive the heat pump. Experiment with different outside temperatures, and different thermostat settings. See what happens when you change the house's insulation by adjusting the temperature loss constant.
sim5388 runs, 624 downloads
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Temperature proportional integral controller Newton's law heat pump
#23

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!
sim712 runs, 184 downloads
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retail strategy iThink
#24

One-dimensional diffusion

Simulates the diffusion of heat through a one meter metal bar when the ends are held at a constant 1 ... Read more
Simulates the diffusion of heat through a one meter metal bar when the ends are held at a constant 100 degrees.
sim229 runs, 83 downloads
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diffusion temperature spactial modeling arrays
#25

School Reform

This Story of the Month reissue examines the complexities of school reform. Inspired by a major sch ... Read more
This Story of the Month reissue examines the complexities of school reform. Inspired by a major school reform effort in Philadelphia, this story explores some of the potential unintended consequences. What happens when the focus of "fixing schools" becomes increasing scores on standardized tests? The Story of the Month series was originally issued starting in May of 2001. While many things have changed since then, many of the issues remain relevant. From corporate corruption, to terrorism, to greenhouse gasses, each story analyzed a past headline news topic from a systems thinking perspective. These topics were modeled using STELLA or iThink with the hopes to gain perspective on the system, stimulate discussion and perhaps adjust our assumptions. isee systems has been re-releasing each Story of the Month from our archives, as originally developed, with an easy-to-access isee Sim Exchange.
sim409 runs
School Reform
#26

Predator Prey Dynamics

This simple model illustrates the basic relationships that govern the dynamics of a predator-prey sy ... Read more
This simple model illustrates the basic relationships that govern the dynamics of a predator-prey system.
sim1996 runs
Environment Biology Science Ecology
#27

Baby Formula Shortage in USA

In February 2022 an Abbott production plant shut down causeing a months long sever baby formula shor ... Read more
In February 2022 an Abbott production plant shut down causeing a months long sever baby formula shortage in the USA. This model looks at the dynamics of that shortage and how parental anxiety played a part.
sim1178 runs, 85 downloads
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supply shortage recall
#28

Cash for Clunkers

On July 24th, 2009 the Car Allowance Rebate System (CARS), commonly known as "Cash for Clunkers," be ... Read more
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!
sim859 runs, 73 downloads
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Cash Cars freebates policy iThink
#29

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
sim2266 runs, 186 downloads
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Thermodynamcis adaptation poiklothermic homeothermic Warm-blooded
#30

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.
sim21 runs, 329 downloads
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Energy consumer energy prices power policy
#31

Interface Workshop Sim

sim155 runs
#32

COVID-19: Vaccinations in the USA

This model explores the vaccination program in the United States and its effort to control the COVID ... Read more
This model explores the vaccination program in the United States and its effort to control the COVID-19 pandemic. It includes vaccine hesitancy, people's behavior in response to perceived risk, and vaccine effectiveness.
sim3837 runs
Biology Science Education COVID-19 Coronavirus
#33

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.
sim5727 runs, 424 downloads
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Measles vaccine infectious disease quarantine WOM
#34

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!
sim27772 runs, 984 downloads
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Systems Thinking zombies epidemic disease susceptible
#35

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.
sim2065 runs, 386 downloads
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human resources headcount
#36

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.
sim594 runs, 299 downloads
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discrete modeling queues conveyors cycle time
#37

Sustainable Shrimping

This Learning Environment should help you understand some basic population dynamics and their releva ... Read more
This Learning Environment should help you understand some basic population dynamics and their relevance to policy development for sustainable shrimping practices. While the specific context is shrimping, the concepts learned should be transferable to other harvesting situations (fishing, hunting, tree farming, etc.)
sim12053 runs, 406 downloads
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population dynamics shrimp harvesting
#38

Supply Chain Management without Forecasting

Accurate demand forecasting is an essential part of most supply chain management algorithms. Yet, s ... Read more
Accurate demand forecasting is an essential part of most supply chain management algorithms. Yet, supply even in the most diligently managed chains can deviate widely from demand. Additionally, any disturbance in demand will often be amplified in a supply chain creating what is known as bullwhip effect. This simulation uses three parsimonious models to demonstrate that supply can be regulated reliably without forecasting demand. The inspiration for these models comes from PID (Proportional, Integral, Derivative) control in engineering controllers that utilize multiple functions of error (discrepancy between goal and actual condition) to regulate a quantity.
sim2373 runs, 358 downloads
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Business operations management
#39

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.
sim6204 runs, 385 downloads
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Environment Biology Education Flu outbreak
#40

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.
sim30 runs, 603 downloads
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Keystone species Wolves wolf Trees Aspen
#41

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.
sim2144 runs, 607 downloads
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supply chain semiconductor oscillation. production planning capacity management
#42

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
sim2105 runs, 284 downloads
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Disaster relieft Water Mark Heffernan George McDonnel scenarios
#43

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?
sim42415 runs, 984 downloads
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Vacation burnout stress productivity workload
#44

Michaelis-Menten Dynamics

The Michaelis-Menten equations are taught in virtually any unit on enzyme kinetics. The problem, for ... Read more
The Michaelis-Menten equations are taught in virtually any unit on enzyme kinetics. The problem, for most students, is that the equations are abstract, and it's difficult for students to develop an intuitive sense for the processes the equations are being used to describe. This model provides a simple, physically-intuitive treatment of the enzyme kinetics phenomenon.
sim196 runs, 110 downloads
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biochemistry enzyme kinetics
#45

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.
sim28218 runs, 1109 downloads
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Student loans loans college interest repayment
#46

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.
sim2762 runs, 426 downloads
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Headcount employees growth manager consultant
#47

Extraverts and Introverts

This map (not a running simulation model) uses STELLA's storytelling feature to explore the concepts ... Read more
This map (not a running simulation model) uses STELLA's storytelling feature to explore the concepts of extraversion and introversion as popularized in the Myers-Briggs personality test.
sim7 runs
Extrovert introvert
#48

Simple Balanced Scorecard

This simple model incorporates the four perspectives of the Balanced Scorecard management strategy i ... Read more
This simple model incorporates the four perspectives of the Balanced Scorecard management strategy into a dynamic whole.
sim2109 runs, 297 downloads
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Balance Scorecard
#49

Climate Champions: Beavers

This short story illustrates the value of beaver-created environments for drought and wildfire resis ... Read more
This short story illustrates the value of beaver-created environments for drought and wildfire resistance.
sim91 downloads
Download Model
Environment Biology Science Economics Ecology
#50

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.
sim614 runs, 344 downloads
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Customer satisfaction employee satisfaction human resourses
#51

Pharmacokinetics

In this simple example try to keep a drug in a patients bloodstream at the thereputic level over a 4 ... Read more
In this simple example try to keep a drug in a patients bloodstream at the thereputic level over a 48 hour period without the drug levels going too low or two high.
sim92 runs
Biology Science Pharmacokinetics drug levels
#52

Virtual Hamlet

Use this virtual laboratory to explore the plot and character development in one of Shakespeare's wi ... Read more
Use this virtual laboratory to explore the plot and character development in one of Shakespeare's widely read plays . What would happen if Hamlet where a “man of actions” as opposed to a “man of thought?” How would different characterizations change both the timing and the overall ending of the play?
sim256 runs, 88 downloads
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Hamlet Literature soft variables intangibles Stella
#53

Virtual Bungee

Virtual bungee jumpers can experiment with different body weights and bungee cord strengths. Then th ... Read more
Virtual bungee jumpers can experiment with different body weights and bungee cord strengths. Then they experiment with different platform heights and even different gravitational fields.
sim468 runs, 68 downloads
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Virtual oscillation Stella Gravity Physics
#54

President & Prime Minister

Whose coffee cools faster? This question quickly becomes relevant for the president and the prime mi ... Read more
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.
sim229 runs, 92 downloads
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President Prime Minister Coffee Newton Temperature
#55

Story of the Month Reissue: Deficit

Examines the often-confused concepts of deficits versus surpluses and tax cuts versus tax rebates.
sim948 runs, 111 downloads
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tax cuts tax rebates deficit surplus social security
#56

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.
sim8372 runs
Guns Schools Public Policy Violence Bullying
#57

An Abundance of Hops

Is the hops imbalance in the craft beer maket a cause for concern for the industry?
sim483 runs, 93 downloads
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Supply chain hops beer surplus shortage
#58

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.
sim554 runs, 158 downloads
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Conveyors reenginering cycle time. crowding
#59

COVID-19 Simulator

This simulator looks at the spread of COVID-19 (Coronavirus) through a city. You can implement poli ... Read more
This simulator looks at the spread of COVID-19 (Coronavirus) through a city. You can implement policies, change assumptions about the disease and see the impacts in realtime.
sim126617 runs
Biology Science Education COVID-19 Coronavirus
#60

Distance and Time

Experiment with different velocities and find out how they impact the solution to this typical dista ... Read more
Experiment with different velocities and find out how they impact the solution to this typical distance and time problem. See how STELLA helps students make sense of often difficult to understand mathematical concepts and equations.
sim531 runs, 114 downloads
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velocity distance time
#61

Pendulum Story

In this model, you will explore the effect that string length, bob mass, and initial starting positi ... Read more
In this model, you will explore the effect that string length, bob mass, and initial starting position have on the motion of the pendulum, ignoring the effects of friction and air resistance. Then, you will investigate how the motion is changed when other forces are taken into account.
sim318 runs
Science Math physics gravity friction
#62

COVID-19 Economy Model

Our latest Story of the Month explores the economic cost of the COVID-19 stay-at-home orders in the ... Read more
Our latest Story of the Month explores the economic cost of the COVID-19 stay-at-home orders in the United States. Are there policies that can help mitigate these costs? Do the provisions of the CARES Act have a significant effect on the economic outcomes? Find out in our new simulation.
sim2451 runs
Business Economics Education COVID-19 coronavirus
#63

The Overturned Truck on the Highway

You are driving on the highway and around the curve is an overturned truck 100 meters away (about ... Read more
You are driving on the highway and around the curve is an overturned truck 100 meters away (about 1 football field). Can you stop in time?
sim270 runs
physics reaction time
#64

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.
sim2889 runs, 304 downloads
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Trump missing middle vicious cycle storytelling manufacturing jobs
#65

Modeling COVID-19 Effectively

This simulation demonstrates the importance of modeling the COVID-19 epidemic properly using high or ... Read more
This simulation demonstrates the importance of modeling the COVID-19 epidemic properly using high order delays vs. perfect mixing.
sim473 runs
Environment Biology Science Education COVID-19
#66

Effects of Assistance on Life Trajectories

Looks at the effect of food, housing and skills interventions on individual life trajectories.
sim271 runs
#67

Tobacco Use Prevention Lab

This model focuses on the populations of smokers and nonsmokers as they age. In addition, it looks a ... Read more
This model focuses on the populations of smokers and nonsmokers as they age. In addition, it looks at the processes of picking up and quitting the habit. Finally, the model looks at health care costs and deaths associated with smoking.
sim158 runs
Science Education iThink Smoking Quit smoking
#68

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?
sim4973 runs, 836 downloads
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Modules finance debt economics housing demand
#69

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!
sim8183 runs, 573 downloads
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Automation job loss AI artificial intelligence labor force
#70

SOTM Reissue: The Israeli-Palestinian Conflict

Originally published in 2003 this model looks at the escalating violence in the Israeli/Palestinian ... Read more
Originally published in 2003 this model looks at the escalating violence in the Israeli/Palestinian conflict and how Systems Thinking might prove useful in building greater insight into both the causes of the conflict and what would need to happen to achieve a lasting peace.
sim1 run
Conflict peace escalation SOTM
#71

Reversible Reactions

In this simple Stella-based Laboratory, you’ll have the opportunity to deepen your understanding of ... Read more
In this simple Stella-based Laboratory, you’ll have the opportunity to deepen your understanding of Le Chatelier’s principle. The lab begins with a simple, idealized model of a reversible reaction. You will be able to see clearly the effect that reversibility plays in an overall dynamic of the reaction. Then, in the final part of the lab, you will be able to experiment with a classic reaction.
sim226 runs
Science Education Chemistry
#72

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.
sim323 runs, 402 downloads
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iThink inventory arrays conveyors supply chain
#73

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.
sim1669 runs, 507 downloads
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Energy residential industrial agricultural energy usage
#74

Non-Separable Differential Equations

Analytically daunting or deceptively simple? The model represents a classic problem—that of mixing h ... Read more
Analytically daunting or deceptively simple? The model represents a classic problem—that of mixing hot and cold water in a bathtub. Experiment with different water temperatures and with different flow rates, showing the overall impact on the temperature of water in the tub.
sim283 runs, 120 downloads
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#75

Co-Flow

Example for TA time
model1989 downloads
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#76

resources allocation

model2470 downloads
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#77

Population

model2277 downloads
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#78

Draining structure

Draining generic structire
model1843 downloads
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draining generic structure decay
#79

Identify structure

model1910 downloads
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#80

testing

model679 downloads
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#81

Compounding Structure

Compounding generic structure
model1755 downloads
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compounding generic structure
#82

Resources and Population

model5036 downloads
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#83

traffic congestion

Explores the dynamics of road use and road construction.
model5390 downloads
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traffic urban planning congestion
#84

Systems In Focus: Conservation

Fishing areas are within the commons, which encourages greater investment in ships when there is dem ... Read more
Fishing areas are within the commons, which encourages greater investment in ships when there is demand. More importantly, we can never really know the population of the given fishery and therefore whether it is in danger of being fished out. This model explores the trade-offs between investing in more ships to catch more fish and the long-term viability of the fishery.
model2556 downloads
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Environment Business Technology Ecology Systems in Focus
#85

Systems in Focus: Agriculture

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.
model6561 downloads
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Systems in Focus agriculture cows dairy
#86

Systems In Focus: Energy

Building capacity in alternative energy sectors takes time and large investments. The transition to ... Read more
Building capacity in alternative energy sectors takes time and large investments. The transition to other sources has to be financially feasible, as well as timely to prevent further damage from pollution. How can the mix of electricity generation technology change, based on both cost and pollution? This Systems in Focus model analyses how capacity can be developed in different energy sectors over time.
model2985 downloads
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Technology Science Systems in Focus Energy
#87

COVID-19 Model

This simulator walks the user through a model showing the spread of the COVID, or Corona Virus throu ... Read more
This simulator walks the user through a model showing the spread of the COVID, or Corona Virus through a city. You can implement policies, change assumptions about the disease and see the impacts in realtime.
model14903 downloads
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Biology Science Education COVID-19 Corona Virus
#88

Systems In Focus: Manufacturing

In this simple example, we have modeled the basics of a bottling plant. Before we can model the proc ... Read more
In this simple example, we have modeled the basics of a bottling plant. Before we can model the process however, we need to consider the supplies required to create the final product, in this case, water. A bottling plant requires a constant supply of purified water. It is usually run through three sets of filters that remove smaller and smaller particles before being sterilized.
model1943 downloads
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Business Systems in Focus Manufacturing
#89

COVID-19 Model By Age

This models the COVID-19 pandemic as an SEIR model disaggregated by age. DIfferent ages have differ ... Read more
This models the COVID-19 pandemic as an SEIR model disaggregated by age. DIfferent ages have different contact rates, death rates, and conformance to social distancing. A thrid-order material delay is used to create the distribution for the tie to become infected and the time to recover.
model4041 downloads
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Biology Science Education COVID-19 Coronavirus
#90

COVID-19 Economy

This models the economic impacts of an extended shutdown due to the coronavirus pandemic and explore ... Read more
This models the economic impacts of an extended shutdown due to the coronavirus pandemic and explore the policies adopted by the United States to mitigate these effects.
model2456 downloads
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Business Science Economics COVID-19 coronavirus
#91

Systems In Focus: Water

A lot is happening behind the scenes to create this picturesque vista. Rainfall on land creates runo ... Read more
A lot is happening behind the scenes to create this picturesque vista. Rainfall on land creates runoff and therefore stream flow. Some of this runoff is absorbed into the soil. Some of that flows beneath the ground to the stream and some returns to the air through evapotranspiration. Another part of it percolates further down through the soil layers to become part of the groundwater, which provides a base level flow for the stream. Using Stella Professional, we are able to draw a map that corresponds closely to the physical world and then simulate that map to see what happens. This both increases our understanding of how this system works and allows us to experiment with different policies that might lead to alternate, more desirable outcomes.
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Environment Ecology Systems in Focus
#92

External Resources Structure

External Resources Generic Structure
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Generic structure external resources
#93

Systems In Focus: Business

Deciding when to expand a business is difficult in any industry. For the airline industry, there are ... Read more
Deciding when to expand a business is difficult in any industry. For the airline industry, there are both large investments and long delays involved in expansion, making it important to test your assumptions as you go.
model2175 downloads
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Business Systems in Focus
#94

Rank array

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Rank array buitlin
#95

Stock-adjustment

Example of stock-adjustment model for TA Time
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#96

Systems In Focus: Environment

One of the greatest environmental challenges we face is how to do more with less: Less raw materials ... Read more
One of the greatest environmental challenges we face is how to do more with less: Less raw materials, less pollution, less damage to the environment. This model shows the life-cycle assessment for the aggregate products manufactured and consumed in a firm, an industry, a region, a nation, or the world. It focuses on solid waste, though it would be easy to add air or water pollution generated and energy consumed at each stage.
model2833 downloads
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Environment Ecology Systems in Focus Renewable Resources Raw Material
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Uploading a Bundle from Zip

Instead of creating bundles, categories, and assemblies one by one, you can upload a single zip file that contains all of your bundle's content. To create your zipped bundle, make a folder with your bundle's name and add subfolders with your categories' names. The folder tree should have the same structure that you want the categories to have in your bundle. Place your assembly .stmx files in the appropriate category folders, then zip your bundle folder and upload it using the Upload Bundle from Zip link above.

Assemblies, Bundles, and Categories

Assemblies are self contained models that demonstrate common ways to connect together building blocks and that can be used as parts of other models. This is analogous to using prefabricated wall and roof pieces to construct a house.

Bundles are groups of assemblies with a common use or theme. For example, a Health Care bundle might contain a variety of assemblies that aid in creating health care models. When you download assemblies from the isee Exchange™, you download an entire bundle, rather than individual assemblies.

Categories are subgroups of assemblies within a bundle. For example, a Health Care bundle might contain a Funding category for assemblies related to the management of hospital funds. All assemblies must be assigned to a category—they cannot be assigned to the root of a bundle.

Assemblies, bundles, and categories can be created and uploaded to the isee Exchange™ via the options on the Manage My Assemblies page. To learn more, visit our help pages, or take our assemblies tutorial.

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 isee 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™.