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Sample Models

The following models were created with STELLA and iThink and published to the web using isee NetSim add-on software.  To explore and experiment with these models within your web browser with Adobe Flash Player support, click on the link provided.

Amalgamated Industries
Amalgamated Industries 
Think through the consequences associated with the development of a widget plant upstream from the Alma Mater School. While the plant will be good for the region’s economy, will it release widgoxyn—a deadly chemical known to interfere with aquatic food webs—in such quantities that it will irreparably damage the stunningly beautiful Alma Mater Pond?
Business Cycle Dynamics
Business Cycle Dynamics 
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.
Headcount Strategy
Headcount Strategy 
Explore a consulting firm’s headcount strategy. Understand the relationship between growth rates, promotion times, headcount pyramid ratios, and attrition rates.
Tobacco Use Prevention Lab
Tobacco Use Prevention Lab 
Use this simple policy design lab, to experiment with policy options for allocating funds from a tobacco settlement. Explore how different programs aimed at adults and kids impact the health of a state populace.
D Multiple Retailer Supply Chain
Multiple Retailer Supply Chain 
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.
Resource Allocation
Resource Allocation 
For virtually any service organization, the allocation of resources is a recurring strategic issue. Use this strategy lab to practice growing an organization while allocating resources to both "selling" and "doing" projects.
Startup Inc
Startup Inc 
Take control of a start-up business in this simulation game. Using a Balanced Scorecard approach, orchestrate tactical and strategic levers to experience what is required to breathe life into a business.
Shifting from Bricks to Clicks
Shifting from Bricks to Clicks 
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.
Cash for Clunkers
Cash for Clunkers 
Explore an alternative to the popular US "Cash for Clunkers" program. Using a combination of fees and rebates, this simulation lets you experiment with options that are self-sustaining AND reduce automobile emissions.
Housing Supply and Demand
Housing Supply and Demand  
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?
Success to the Successful
Success to the Successful 
Explore the model behind this classic Systems Archetype to understand well known behavior patterns like the rich getting richer and the poor getting poorer. What is it about the structure of our decision policies that determines success?
 
H1N1 Flu Outbreak
H1N1 Flu Outbreak 
What is most effective in controlling the outbreak of the H1N1 flu virus in schools? Is it better to vaccinate or stay home? Use this learning lab to understand how infectious disease spreads and why H1N1 has been signaled a pandemic.
Distance and Time Problems
Distance and Time Problems 
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.
Predator-Prey Dynamics
Predator-Prey Dynamics 
As the manager of a small but thriving natural wilderness area, would you allow a one-time harvest of a key species in the wilderness? What impact might it have on other populations? In this simple predator-prey system, experiment with different predator harvests, and observe the effects on both the predator and prey populations over time.
Pharmacokinetics
Pharmacokinetics 
Play the role of physician, trying to keep the drug level in a virtual patient’s bloodstream in the therapeutic range. Learn the basic processes of drug-physiology interaction.
Plant Succession Dynamic
Plant Succession Dynamic 
See the progression that plants go through in a forest ecosystem, from forb to hardwood with each plant type readying soil conditions for the next type in the progression.
Mystery on the Island of Borneo
Mystery on the Island of Borneo  
What do the bubonic plague, falling roof beams and dead fish have in common? Read this story and unfurl the STELLA/iThink model to solve the mystery.
Sustainable Shrimping
Sustainable Shrimping 
This interactive lesson in sustainability presents students with the challenge of developing a shrimping policy that allows the maximum sustainable yield.
Temperature Control
Temperature Control 
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.
Overturned Truck on the Highway
Overturned Truck on the Highway  
You’re driving on the highway and around the curve is an overturned truck. Can you stop in time? Experiment with factors such as speed, reaction time and road conditions. What happens if it’s raining or your tires are bald?
Virtual Hamlet
Virtual Hamlet 
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?
 
Upcoming Webinars
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Tuesday, Apr 29, 2014
12:00 - 1:00 PM EDT
Live Webinar Series
Introduction to
Dynamic Modeling II

Wednesday, Apr 16, 2014
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Upcoming Workshops
Intro to Dynamic Modeling
May 5 and May 6, 2014
Waltham, MA
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Recent Releases
STELLA Modeler for iPad 1.0.2
STELLA Modeler for iPad 1.0
STELLA and iThink 10.0.5
STELLA and iThink 10.0
isee NetSim 2.0.1
isee NetSim 2.0
isee NetSim Server 2.0.1
isee NetSim Server 2.0
isee.NET Framework 2.0.1
isee.NET Framework 2.0
 
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