The divergencies in the results of studies of the whole-part problem are briefly indicated, and it is concluded that the confusion is largely attributable to (1) the failure to define "whole" and "part" except in terms of length, (2) the failure of agreement on a measure of the "economy of learning," (3) too great emphasis on the habituation section of the learning curve rather than the earlier perceptual part, (4) lack of proper experimental methods. It is suggested that Gestalt psychology offers a definition of a whole which could be used with profit in studying the whole-part problem.