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Causal Loops Stock and Flow
Spring 2016
- Q126. Why do people scream into cell phones? Answer in
terms of feedback. I talk I hear +
- Land Line
I talk I hear x
- Cellular
Causal Loops Stock and Flow Spring 2016 Q126. Why do people scream - - PowerPoint PPT Presentation
Causal Loops Stock and Flow Spring 2016 Q126. Why do people scream - - PowerPoint PPT Presentation
Causal Loops Stock and Flow Spring 2016 Q126. Why do people scream into cell phones? Answer in terms of feedback. Land Line Cellular I talk I talk - + - x I hear I hear Causal Loops What can be bigger or smaller? How do these
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Causal Loops
- What can be bigger or smaller?
- How do these relate to one another?
- How do the loops behave?
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Heating a House
- What can be bigger or smaller?
- Room temperature
- Heat coming into room
- How do these relate to one another?
- More heat … higher temperature
- Higher temperature … less heat
- How do the loops behave?
Heat Temperature +
- Balancing
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Q112
Sketch a causal loop diagram: Being sad… …makes you frown… …which makes people avoid you… …which makes you lonely… …which makes you sad…
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Q113
Sketch a causal loop diagram for this system (be sure to label each link and the overall loop). Comment on the long term equilibrium of this system. Being happy…
- 1. …makes you to smile…
- 2. …makes people approach you…
- 3. …makes you feel social…
- 4. …makes you happy…
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Sheep
- What can be bigger or smaller?
- How do these relate to one another?
- How do the loops behave?
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Sheep
- What can be bigger or smaller?
- number of sheep
- number of lambs
- number of dead sheep
- How do these relate to one another?
- more sheep … more lambs
- more sheep … more dead sheep
- more lambs … more sheep
- more dead sheep … fewer sheep
- How do the loops behave?
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Sheep
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Sheep
“valves”
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Sheep
+ +
DeathRate Fertility
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Other Examples
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Sheep and Wolves
- Sheep have lambs at rate Bs per time period
- Wolves have wolflets at rate Bw per time period
- Sheep die when eaten by wolves
- A wolf eats P sheep per time period
- Wolves die from old age at rate Dw per time period
- Draw causal loops
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Sheep Lambs + + Wolves Wolflets + + +
- B
R R
W
- l
v e s Sheep
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Innovation
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Moore's tech adoption cycle
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