When Do You Think About Using One of These?

A mental model is a tool that you can use to help make a decision as to which route to take, or which is the most likely reason for something that happened. You have to understand the models and apply them in order to get the benefit from them. There are concepts here that we've come across before that there have been entire books written about that are very lengthy. It's ultimately, when do you think about using one of these?