Learning exercise adapted from Donella Meadows "Thinking in Systems," Part One: Systems Structure and Behavior. The example is a single stock system (room temperature) managed by two competing goal-seeking balancing loops, each of which is attempting to pull the stock to a different goal.
A causal loop diagram of thermostat action including conversions between heat and temperature and outside temperature. The simulation model is at Insightmaker 393
A model of thermostat action including conversions between heat and temperature and outside temperature. See also, after this model, how the concept map of a thermostat at IM-735 changed to the concept map at IM-736
This is a stock flow map representation From Evans RG and Stoddardt GL 1990 paper Soc Sci Med 31(12)1347-63 , also published in a book by Evans, Barer and Marmor, Why are some people healthy and others not?: The determinants of population health See IM-425 for a simulation.
Learning exercise adapted from Donella Meadows "Thinking in Systems," Part One: Systems Structure and Behavior. The example is a single stock system (room temperature) managed by two competing goal-seeking balancing loops, each of which is attempting to pull the stock to a different goal.
From Evans RG and Stoddardt GL 1990 paper Soc Sci Med 31(12)1347-63 , also published in a book by Evans, Barer and Marmor, Why are some people healthy and others not?: The determinants of population health. This is a steady state model of IM-424 that ignores deaths and population increase. This is extended in IM-451
A causal loop diagram of thermostat action including conversions between heat and temperature and outside temperature. (Insight 394) extended to include fiddling with the thermostat controls based on differential house and outside temperatures. The simulation model is at Insightmaker 393.
The simplest negative feedback dynamic: a constant upper limit. Used to explore Insightmaker options.
Note: temperature units don't work. The simulation uses dollars to show how the relationships between units. Removing units (making every variable unitless) is also an option.
The above note is now untrue. I changed the unites of "heating rate" to "degree/minutes" and do not now get a units error. (Paul Newton)
From Evans RG and Stoddardt GL 1990 paper Soc Sci Med 31(12)1347-63 , also published in a book by Evans, Barer and Marmor, Why are some people healthy and others not?: The determinants of population health. To IM-425 We add impacts of spending and a "Thermostat" setting for population health controlling health spending.
The simplest negative feedback dynamic: a constant upper limit. Used to explore Insightmaker options.
Note: temperature units don't work. The simulation uses dollars to show how the relationships between units. Removing units (making every variable unitless) is also an option.
A rich picture representation of the interactions described in Producing Health Consuming HEalth Care and usually referred to as the EBM Model or Field Theory of Health
Learning exercise adapted from Donella Meadows "Thinking in Systems," Part One: Systems Structure and Behavior. The example is a single stock system (room temperature) managed by two competing goal-seeking balancing loops, each of which is attempting to pull the stock to a different goal.
A model of thermostat action including conversions between heat and temperature and outside temperature. See also, after this model, how the concept map of a thermostat at IM-735 changed to the concept map at IM-736
From Evans RG and Stoddardt GL 1990 paper Soc Sci Med 31(12)1347-63 , also published in a book by Evans, Barer and Marmor, Why are some people healthy and others not?: The determinants of population health. This is a steady state model of IM-424 that ignores deaths and population increase. This is extended in IM-451
Learning exercise adapted from Donella Meadows "Thinking in Systems," Part One: Systems Structure and Behavior. The example is a single stock system (room temperature) managed by two competing goal-seeking balancing loops, each of which is attempting to pull the stock to a different goal.
The simplest negative feedback dynamic: a constant upper limit. Used to explore Insightmaker options.
Note: temperature units don't work. The simulation uses dollars to show how the relationships between units. Removing units (making every variable unitless) is also an option.
From Evans RG and Stoddardt GL 1990 paper Soc Sci Med 31(12)1347-63 , also published in a book by Evans, Barer and Marmor, Why are some people healthy and others not?: The determinants of population health. To IM-425 We add impacts of spending and a "Thermostat" setting for population health controlling health spending.
Learning exercise adapted from Donella Meadows "Thinking in Systems," Part One: Systems Structure and Behavior. The example is a single stock system (room temperature) managed by two competing goal-seeking balancing loops, each of which is attempting to pull the stock to a different goal.
The simplest negative feedback dynamic: a constant upper limit. Used to explore Insightmaker options.
Note: temperature units don't work. The simulation uses dollars to show how the relationships between units. Removing units (making every variable unitless) is also an option.
