Solving and learning, from general to specific.

One doesn't need to know every possible events and interactions among them which can happen within a certain domain of theorical knowledge and or experience, in order to rightly judge, plan and act on a certain situation belonging to that domain, if one knows the essentials which are the basis that guide those events and interactios and therefore, in some extent, the ways of solving never before seen problems as well.

The capability of solving specific problems using essential knowledge, is the skill of generalization, that is, applying one or a set of very basic knowledge in the most diverse class of problems belonging to a certain domain or even from different domains that intersect in some extent.