"Point B" = Key take aways, or essential principles

Determine essential principles, or fundamental rule that students are to get from this lesson.  For example, since it has been said the we study history so that we are not doomed to repeat it, then a history lesson may teach something that a student should avoid repeating (an essential principle or fundamental rule as what not to do).

An association is the germ of a principle (Barzun, 1981).  One could teach that Washington D.C. is the capital of the U.S. and leave it at that.  However, for a student from another country, knowing about Washington the person would establish why the U.S. capital has his name (the logic behind the name, and therefore a principle) (Barzun, 1981).   One could also teach students to memorize the multiplication tables, but teaching that 4x4 is the same procedure as 4+4+4+4 (addition, something that the student already knows {their "Point A!"}), points to a principle of mathematics (Barzun, 1981). 

A principle can also be seen as a relationship between two or more changes, like "water expands when it freezes".  It is a general rule that can be generalized, or applied to multiple situations.

See Dewey's description of the formal steps of instruction which ends with a detailed description of the generalization and application of principles.

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