A mental model is an explanation of how something works. They help understand life.
Assessing a situation and making a decision requires identifying how mental models factor into them. Understanding of a lattice-work of models assist in seeing the complexities inherent in each problem to determine the outcome.
Below is a running list of mental models.
Best Alternative to a Negotiated Agreement (BATNA)
Commandos vs. Infantry vs. Police
Consequence Conviction Decision Matrix
Law of Diminishing Marginal Utility
Optimal Fragmentation Principle
Simple Model of Rational Crime
Sustainable Competitive Advantage