All you wanted to do was put a bird feeder in your yard to attract birds and make for a more pleasant morning. And...
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And? It's All Connected
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What do activities of these images have in common?
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Clone of Essence Property # 3
While these pictures represent very different things there is a common essence.
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Clone of Essence Property # 1
What do activities of these images have in common?
Clone of Essence Property # 3
The interaction of a population of Moose and Wolves.
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The Essence of And?
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There are three types of models most commonly used.
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Rich Pictures, Causal Loop Diagrams and Stock & Flow Simulation Models are the three types of models most commonly used.
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All the following have a common characteristic.
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Clone of Essence Property # 2
All the following have a common characteristic.
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Clone of Essence Property # 2
All the following have a common characteristic.
Clone of Essence Property # 2
All you wanted to do was put a bird feeder in your yard to attract birds and make for a more pleasant morning. And...
Clone of Bird Feeder Dilemma
What do activities of these images have in common?
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Clone of Essence Property # 3
Introduce the concept of modeling and simulation.
Clone of Clone of Sustaining the Forest
Introduce the concept of modeling and simulation.
Clone of Sustaining the Forest
The interaction of a population of Moose and Wolves.
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The Essence of And?
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There are about fifteen known archetypes with an interesting set of relationships among them.
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There is a new version of this model at
Frequently Recurring Structures
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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.
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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
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While these pictures represent very different things there is a common essence.
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Clone of Essence Property # 1
While these pictures represent very different things there is a common essence.
Clone of Essence Property # 1
The model starts in 1900. In the year 2000 you get the chance to set a new emission target and nominal time to reach it. Your aim is to have atmospheric CO2 stabilize at about 400 ppmv in 2100. From Sterman, John D. (2008) Risk Communication on Climate: Mental Models and Mass Balance. Science 322 (24 October): 532-533.
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Are there environmental/physical limits to humanity? Based on the Are There Limits? blog post by Tom Fiddaman.
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Simplest Innovation diffusion model from Sterman's Business Dynamics
Ch 9
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There's actually more to filling a swimming pool with water than you might realize.
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