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

All the following have a common characteristic.

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

The structure responsible for rabbit population growth.

What do activities of these images have in common?

The structure responsible for rabbit population growth.

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

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?

Balancing Loop with Stock & Flow Diagram.

What do activities of these images have in common?

Balancing Loop with Stock & Flow Diagram.

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

Balancing Loop with Stock & Flow Diagram.

Balancing Loop with Stock & Flow Diagram.

Introduce the concept of modeling and simulation.

The structure responsible for rabbit population growth.

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?

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

Balancing Loop with Stock & Flow Diagram.

What do activities of these images have in common?

All the following have a common characteristic.

What do activities of these images have in common?

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