Understanding relationships is the foundation of effective problem solving. Though relations exists on multiple levels.

Use a bathtub model to investigate the manner in which inflows and outflows govern the quantity of a stock. Extend the structure to create and investigate the relationships of a goal seeking balancing loop.

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The following model was submitted by Lise Inman & Keith Margerison for inclusion in the ILE currently under development. I think it's a useful model which gets interesting as the arrival interval gets smaller and the queue backs up. So, what do you think of the model and what insights can we surface with this model?

This is a more Traditional Career Model of how education works, with an increased lifetime earnings from going to college. The following are links to the other two models in the series.

• Loan Cost Model
• Savings Model

Basic Stock & Flow models for use in Systemic Perspective video.

Comparison of scalar and vector version of the rabbit population model.

Examples of reinforcing and balancing loops enhanced with images to maybe them more visually engaging.

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.

How a Savings Account works.

The structure responsible for rabbit population growth.

This page contains a set of models associated with the LinkedIn discussion which was an endeavor to develop a Systemic Perspective associated with Chris Argyris' "Teaching Smart People How to Learn" article.

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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.

The model construction process is actually a balancing loop which endeavors to employ an abstract version of real events to form a model which produces conclusions and behavior which mimic the real events.

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.

New Learning tend to reduce Outdated Thinking, Communicating & Learning though our Outdated Thinking, Communicating & Learning inhibits new learning. The question is then how do we break this cycle. Adopted from "An Introduction to Systems Thinking with STELLA" by Barry Richmond.

Initial causal loop diagram for the influences leading to the acceptance of Systems Thinking.

From Jay Forrester 1971 book World Dynamics, the earlier, simpler version of the World 3 Limits to Growth Model. Adapted by Geoff McDonnell from Mark Heffernan's ithink version at Systemswiki.org.

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The generic stock & flow form for a balancing loop.

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We are embedded in a larger system and unless we realize it an act accordingly we are likely to be the victim of it. From Introduction to System Dynamics: Overview by John Sterman

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

Some people have found it easier to communicate interactions and their implications with Connection Circles rather than Causal Loop Diagrams.

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Population Growth in an Agrarian Society with the addition of Deaths and Food Consumption.

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​Example of using a Macro as a counter. See the comment on Counter for a definition of the Macro then run the simulation to see the counter in action.