This model is derived from the paper "Nobody Ever Gets Credit for Fixing Problems that Never Happened: Creating and Sustaining Process Improvement" by Nelson P. Repenning and John D Sterman. See Insight 752 for a causal loop version of this model.

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The interaction of a population of Moose and Wolves.

There are about fifteen known archetypes with an interesting set of relationships among them.

There is a new version of this model at

Frequently Recurring Structures

All you wanted to do was put a bird feeder in your yard to attract birds and make for a more pleasant morning. And...

When endeavoring to develop an understanding of the nature of something it is generally useful to create a model of some type to aid in surfacing that understanding.

While these pictures represent very different things there is a common essence.

Consider the following "Sustaining the Forest" model intended to provide another example of how unexpected the behavior of a web of extended interactions can be.

All you wanted to do was put a bird feeder in your yard to attract birds and make for a more pleasant morning. And...

CLD of Eric Wolstenholme Syst. Dyn. Rev. 23, 371–389, (2007) See IM-1008 for a stock flow version.

How a Savings Account works.

The structure responsible for rabbit population growth.

Little Red Riding Hood walking through the woods to Grandma's house. How long will it take?

Yesterday's actions are responsible for the world we experience today. And today's actions are responsible for the world that we will experience tomorrow. The "Creating the Future" model is intended to provide a better sense of the common process associated with the unexpected unfolding of the future..

This model depicts the interactions of Aesop's Fable "The Boy Who Cried Wolf."

When one undertakes to create a model there are a number of guidelines that are considered essential for consideration if there is to be a success with the model.

The purpose of this model is to have the user change the value of stocks, flows and converters to experience a variety of different graphical results. Understanding this generic model is important pre-requisite to learning about intravenous drugs in the body, radioactivity, self-esteem, water flowing from a drain and many other basic natural systems.

How does a goal seeking structure progress with a resource constraint.

Joe P. is currently managing a project that's behind schedule and he's experiencing substantial pressure to get the project back on track.

Influences which work in opposition to sustainable capitalism and influences that might work to further promote it.

This Loan Cost Model is the second in the series. It takes into account the potential cost of student loans in the case that the student does not manage to graduate college or does not succeed in their career.

• Traditional Career Model
• Savings Model

What's the real difficulty associated with managing time?

Development of a model to understand why we don't all get rich from investment accounts.

This is a model depicting the interactions of the Aesop's Fable "The Boy Who Cried Wolf."