Our [[SON]]s and [[MON]]s are built on [[theory|theories]]. The theories suggest how the world is working. Which event will cause other event or events, and what are the properties of objects in our world. In trying to manage the world around us we are using our theories. For instance, when we want to reach some destination in our city, we can use several alternative theories, to build a way to reach that destination. We know about cars, and public transportation, and cycling and walking, and we can figure out which is the most economical or fast way to reach our destination. Some of our theories are explicit, and probably most of the are implicit. When we suggest a way of action, our mind uses these theories to propose a way of action.

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