Diagram the basic mechanisms, the feedback loops, of the system. The first step, deciding on the model purpose, means focusing on a problem and narrowing down the model’s audience …

Figure 4.19 shows the stock and flow diagram for the Kaibab ecosystem model, and exercise 17 provides a detailed description of all of the variables in the model, along with guidance on …

Stocks and flows are the foundation of system dynamics modeling. But how exactly do they work? Stocks are entities that can accumulate or be depleted, such as a bathtub, which fills with …

We investigated a 2d system and found a new type of behaviour: oscillations. With probability p the wolf eats the sheep. Upon eating the sheep with probability e the wolf will use the extra …

There are four basic models in the Sample Models section of the NetLogo Models Library that demonstrate the use of the System Dynamics Modeler. All four basic models explore …

The steps we describe below provide a strong foundation for understanding the connections between CLDs and stocks and flows and add order to an often chaotic process (see …

The SD process Stock-Flow Diagram (SFD) Causal Loop Diagram (CLD) SD specificities Two examples. Overview. Method for modeling and simulating dynamically complex …

• You can build modular, hierarchical, and object-oriented system dynamics models. System dynamics components can be packaged into AnyLogic agents, parameterized, organized in …

To exemplify the various mechanics of a stock-and-flow diagram, we have designed a simple illustration snippet of a model in Figure 3.

View flows and stocks – does this make sense? How does changing constant variables change the stock? What happens to the stock? • When is the stock of people with diabetes at its …