Glover is not satisfied with the term 'dynamic' psychology and suggests that metapsychology is more comprehensive and less tendentious. He points out that 'dynamic' psychology is a term associated with psychoanalysis but warns that psychoanalysis should not try to preempt the concept as all its own. He lists ten features which characterize dynamic psychology; but above all what distinguishes this from other psychology ('normal' or descriptive) is the acceptance of the concept of psychic regression and the primary mental processes. Glover recognizes the need to establish dependable criteria of description, classification, and interpretation in psychoanalysis, but since 'the action of the mind is neither so measurable nor visible nor controllable as the expansion of metals', the psychoanalyst need not unduly concern himself with the frequently made charge of being unscientific. The real danger in the future is the temptation 'to bowdlerize or water down psychoanalytic findings', with an overemphasis on environmental factors to the neglect of endopsychic ones.