Every model we engage with is created for a specific purpose. Models tell us something about a system that is hard to see in the real world. They simplify things. This means there is always something they are leaving out. There is always something they are not telling us so that we can focus on the purpose.

Take a look at the fire models below.

Consider the following:

1. What is the model's purpose?

2. What is one fire characteristic that each model leaves out?