ABSTRACT
Concepts of the first type would be mass, electron, reaction potential, gene and drive; concepts of the second type would be physics, society and personality. It is only with concepts of the first kind that accurate, preferably operational, and if possible quantitative, definitions are possible, and it is only with concepts of this kind that disputes and discussions about proper definitions have any point. 'The behaviour of patients and clients and therapists in psychotherapy is as unspecified as ever it was, and this is much unspecified indeed. What are exact terms in learning theory then become as inexact as their semantic equivalents in psychotherapeutic and personality theory, and the connections between the propositions are connections which can be demonstrated to hold for the other. Both D. R. Miller and O. H. Mowrer have shown great ability and meticulous regard for scientific procedure in their work on the development of learning theory.
