High Quality Content by WIKIPEDIA articles! Exemplar, in the sense developed by philosopher of science Thomas Kuhn, is a well known usage of a scientific theory. According to Kuhn, scientific practice alternates between periods of normal science and extraordinary/revolutionary science. During periods of normalcy, scientists tend to subscribe to a large body of interconnecting knowledge, methods, and assumptions which make up the reigning paradigm. Normal science presents a series of "puzzles" that are solved as scientists explore their field. The solution to some of these puzzles become well known and are the exemplars of the field.