It’s crucial for us to understand as many mental models as possible. As the adage goes, a little knowledge can be dangerous and creates more problems than total ignorance. No single model is universally applicable – we find exceptions for nearly everything. Even hardcore physics has not been totally solved.

You may have noticed  students who just try to remember and pound back what is remembered. Well, they  fail in school and in life. You've got to hang experience on a latticework of models in  your head.  What are the models? Well, the first rule is that you've got to have multiple models—  because if you just have one or tw... See more