A mental model is a representation of an external reality inside your head – a kind of cognitive map. The purpose of mental models is to gain and understand knowledge about the world through key multidisciplinary concepts — something schools don't teach. The closer you get your cognitive processes (the way your brain approaches a problem) to reality, the better the decisions you’ll make in life.
Academic structure, by and large, discourages training your brain from a multidisciplinary approach. If you want to be a world-class thinker, you must develop a mind that can jump boundaries from one discipline to another.
Read more in-depth analysis about each mental model. These models are applicable to teachers, students, parents and professionals.