Mortimer J.Adler

is: Ask questions while you read—questions that you yourself must try to answer in the course of reading.

Thus we can roughly define what we mean by the art of reading as follows: the process whereby a mind, with nothing to operate on but the symbols of the readable matter, and with no help from outside,* elevates itself by the power of its own operations.

Inspectional reading is the art of skimming systematically.