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

Supply and Demand tend to oscillate back and forth through Price.

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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

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

Investigations into the relationships responsible for the success and failure of nations. This investigation was prompted after reading numerous references on the subject and perceiving that *Why Nations Fail: The Origins of Power, Prosperity, and Poverty* by Acemoglu and Robinson seem to make a great deal of sense.

What do activities of these images have in common?

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

Evolving view of Systems Thinking from The Evolution of Systems Thinking by Jorge Taborga.

An example of dynamic equilibrium from Change Management: A Columbo Approach.

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

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.

Population Growth in an Agrarian Society with the addition of agriculture.

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?

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

While all things are related for a particular situation all things are not relevant. We need to develop a simplified model of reality which depicts those interactions which are responsible for the patterns of behavior and current situation. We want the simplest model which enables the requisite understanding. This is no easy task though.

How a Savings Account works.

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.

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

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

21st Century Systems Thinking Skills as depicted b Viktor Vojko. Adapted from Systems thinking: critical thinking skills for the 1990s and beyond by Barry Richmond.

The structure responsible for rabbit population growth.

A Systems Archetype has a very well defined structure that produces a characteristic pattern of behavior and there are well defined strategies for dealing with the structure.

A Conveyor is just a special type of a stock.