Z203 from System Zoo 1 p88-90

System Zoo Z101: Single integration from System Zoo 1 by Hartmut Bossel

Oscillator with limit cycle from Z202 System Zoo 1 p84-87

System Zoo Z103: Exponential growth and decay from System Zoo 1 by Hartmut Bossel

Based on System Zoo EZ412D, EZ411, EZ412A.

System Zoo Z110: Logistic growth with stock-dependent harvest from System Zoo 1 by Hartmut Bossel

Based on the Market and Price simulation model in System Zoo 3, Z504. I made some more intrusive changes that make the model more realistic, or more 'economic', in another version 'simplified and improved'. 

Z204 from System Zoo 1 p91-94

System Zoo Z112: Double integration and exponential decay from System Zoo 1 by Hartmut Bossel

System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel

Attempting to outdo an opponent leads to escalation. A weaker response leads to De-escalation. A slightly more complex  form of Insight 972.  ​Z508 p36-38 System Zoo 3 by Hartmut Bossel.

Exploring the conditions of permanent coexistence, rather than gradual disappearance of disadvantaged competitors. ​Z506 p32-35 System Zoo 3 by Hartmut Bossel.

Insight Maker model based on the Z415 System Zoo model originally developed in Vensim.

System Zoo Z106: Simple population dynamics from System Zoo 1 by Hartmut Bossel

This models the progressive decline of the ability for self-reliance and the growing dependence on outside help. ​Z508 p39-42 System Zoo 3 by Hartmut Bossel. Strong outside help causes a collapse of self-help capacity. Weak outside help produces a stable combination of wellbeing and self-help capacity.

Based on the Market and Price simulation model in System Zoo 3, Z504. In this model the profit calculations were not realistic. They were based on the per unit profit, which does not take items not sold into account. Also the model was not very clear on profit since it was included in the total production costs and consequently in the unit costs and subsequently profit was calculated by subtracting unit costs of the market price. Thus profit had a double layer which does not make the model better accessible. I have tried to remedy both in this simplified version.

Z209 from Hartmut Bossel's System Zoo 1 p112-118. Compare with PCT Example IM-9010

Based on System Zoo EZ411 Tourist.mdl Vensim model. Caroline Brennan 21/02/2018.

Often a single prey population is the source of food for several  competing predators (e.g. mice as prey of foxes and birds of prey)​. Here again a reliable intuitive assessment of long-term development resulting from the particular system relationship is impossible. A simulation model can assist in recognizing development trends inherent in the system structure even if in reality a variety of other factors determine the development and may cause it to proceed on a somewhat different path.

Adapted from Hartmut Bossel's "System Zoo 3 Simulation Models, Economy, Society, Development."

​Population model where the population is summarized in four age groups (children, parents, older people, old people). Used as a base population model for dealing with issues such as employment, care for the elderly, pensions dynamics, etc.

Systems Zoo model Z305 Carbon balance of forests (Bossel, 2007). This implementation does not include human use of fuelwood and timber.

Systems Zoo model Z308 Forest Dynamics (Bossel, 2007)

Insight Maker model based on the Z415 System Zoo model originally developed in Vensim. Adaptation of this model. The adaptation involves adding sliders to improve interaction with the model.

Perceptual Control Theory Model of Balancing an Inverted Pendulum. See Kennaway's slides on Robotics. as well as PCT example WIP notes. Compare with IM-1831 from Z209 from Hartmut Bossel's System Zoo 1 p112-118