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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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.

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The Essence of And?

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The interaction of a population of Moose and Wolves.

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The Essence of And?

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

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And? It's All Connected

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

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

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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..

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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 9781 for a simulation of this model.

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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.

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Systemswiki BCTD

To develop insights regarding a situation of interest there are a number of things should be considered to ensure a view of the relevant influences.

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Rich Pictures, Causal Loop Diagrams and Stock & Flow Simulation Models are the three types of models most commonly used.

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There's actually more to filling a swimming pool with water than you might realize.

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There are limits to what one can infer from a qualitative model.

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This Romeo and Juliet Model was adapted by Geoff McDonnell from Michael J Radzicki (1993) Dyadic processes, tempestuous relationships, and system dynamics, System Dynamic Rev. 9 (1) :79-94

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

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

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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.

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

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

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

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The model starts in 1900. In the year 2000 you get the chance to set a new emission target and nominal time to reach it. Your aim is to have atmospheric CO2 stabilize at about 400 ppmv in 2100.  From Sterman, John D. (2008)  Risk Communication on Climate:  Mental Models and Mass Balance.  Science 322 (24 October): 532-533.

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What's the real difficulty associated with managing time?

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How a Savings Account works.

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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.

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