All the following have a common characteristic.

The interaction of a population of Moose and Wolves.

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.

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.

The interaction of a population of Moose and Wolves.

What do activities of these images have in common?

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

The interaction of a population of Moose and Wolves.

The interaction of a population of Moose and Wolves.

All the following have a common characteristic.

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

All the following have a common characteristic.

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

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

SystemsWiki's Musings

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.

The structure responsible for rabbit population growth.

There are limits to what one can infer from a qualitative 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 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 the following have a common characteristic.

The interaction of a population of Moose and Wolves.

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