Psychological research and theory has been in the past, and is at present, vitiated by three groups of presuppositions and tendencies. Firstly, by a rigid ideal of preciseness, which produces in the mind of psychologists a biased predilection for selecting and emphasizing those facts which lend themselves best to a precise investigation, and for neglecting those facts with which this is not the case. Secondly, by certain psychological presuppositions rooted in the ideological background of the society to which the psychologist (...) himself belongs; these presuppositions induce him often to state, unwittingly, certain of his problems along the lines suggested by the predominant ideology. And thirdly, by the tendency to overlook, or to neglect, certain very important facts because these facts appear to be quite “obvious”. (shrink)