Example of using Pulse function to create a recurring delay.

Citizenship: Machinebrian View from Gardens of Demoncracy

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A simple Susceptible - Infected - Recovered disease as a stock and flow model.

Machine sequencing model for Gary Ramages.

A Tragedy of the Commons situation exists whenever two or more activities, each, which in order to produce results, rely on a shared limited resource. Results for these activities continue to develop as long as their use of the limited resource doesn't exceed the resource limit. Once this limit is reached the results produced by each activity are limited to the level at which the resource is replenished. See also Archetypes.

What do activities of these images have in common?

All the following have a common characteristic.

The limits to growth structure is based on the basic growth structure. And, as should be obvious, nothing grows forever as growth requires resources. Those required resources become a limits to growth. See also Archetypes.

What do activities of these images have in common?

Bathtub model with max fill rate control added to account for the maximum rate water can enter via the faucet.

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Success to the successful archetype represents two reinforcing structures which may be in a delicate balance though as soon as one gains a small advantage the resource allocation favors the more successful and the result is then rapidly skewed in the direction of the more successful. See also Archetypes.

Simple bathtub model to show the difference between Stock and Flow. Run the model with various values for filling and draining to see the implications.

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An implementation of the classic Game of Life using agent based modeling.

Rules:

• A live cell with less than two alive neighbors dies.
• A live cell with more than three alive neighbors dies.
• A dead cell with three neighbors becomes alive.

The Model being used as part of the Collaborative Model Development project at Systems Thinking World.

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

Examples of reinforcing and balancing loops enhanced with images to maybe them more visually engaging.

This is the sample model used as a demo for enfolding and unfolding a model. This is what we had to do before the Storytelling feature was developed. Save this one for posterity!

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We often set out to solve a problem or accomplish some particular result and things seem to go as planned. As time progresses it seems that progress becomes more and more difficult, if not impossible, and things may actually become worse than when we started. When this happens it is typically a Fixes that Fail structure that's operating. See also Archetypes.

Video

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This model is an element of the effective problem solving program.

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Image from "All models are wrong: reflections on becoming a systems scientist" by John Sterman.

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

The goal seeking structure endeavors to bring a balance between a current state and a desired state. This is one of the two foundation archetypes. The other being the growth structure. See also Archetypes.

A Growth and Underinvestment structure is simply an elaborated Limits to Growth structure where the growth inhibitor is part of another Balancing Loop with an external standard and some delay. The real nasty thing about this structure is that the two Balancing Loops form a single Reinforcing Loop which inhibits growth.

Video

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Simple savings account.