Systems Thinking and System Models

• Global, Top Down, Aggregate Models

• Numerical Integration of Difference Equation(s) (Iterated Arithmetic)
  • Have = Had + Change (Euler Model)
  • Could use RK4 or other algorithms

• Identify Relevant Quantities:
  • Stocks, "Buckets", Reservoirs, Levels
  • Rates of Change
  • Parameters that Increase or Decrease
  • Dependencies ("Guzzinta's")

• Define Your Story, Build a Concept Map
• Use of Controls Helps Visualize Variation
• SEIR Example in Vensim(right click to save as)