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.

Balancing Loop with Stock & Flow Diagram.

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.

What do activities of these images have in common?

What do activities of these images have in common?

All you wanted to do was put a bird feeder in your yard to attract birds.

All the following have a common characteristic.

Introduce the concept of modeling and simulation.

What do activities of these images have in common?

The interaction of a population of Moose and Wolves.

The structure responsible for rabbit population growth.

The structure responsible for rabbit population growth.

The Home Heating System can be used to demonstrate how we get caught in dilemmas and become victims of ourselves.

What do activities of these images have in common?

What do activities of these images have in common?

Introduce the concept of modeling and simulation.

The structure responsible for rabbit population growth.

The interaction of a population of Moose and Wolves.

Balancing Loop with Stock & Flow Diagram.

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

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 common archetype of systems that include relapse or recidivism allows exploration of the unintended effects of increasing upstream capacity and swamping downstream capacity. The increase in the relapse rate eventually returns to swamp upstream capacity as well. A social welfare example, based on a TANF case study, from How Small System Dynamics Models Can Help the Policy Process. N. Ghaffarzadegan, J. Lyneis, GP Richardson. System Dynamics Review 27,1 (2011) 22-44 Conference version at http://bit.ly/HlxtZj

A small change in one variable can have a marked impact on multiple variables. Run the model [quits change] = 0  and consider the output. What happens if  you change [quits change] = 5. Run the model to find out. Was the change what you expected?

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.