Third, personality events may be treated as degrees of resumption of terminal situations of a type which have already been observed. Lying in bed after waking up in the morning, whenever there are difficulties to cope with, may be interpreted as a reactivation of an earlier psychological impulse to lie still and be waited on. Fourth, personality events may be construed as approximations to “normal” terminal events which are observed for the biological or cultural category of the individual. Thus heterosexuality may be postulated as a tendency of a human being, although he consummates no heterosexual adjustments. Fifth, personality events may be interpreted in terms of end situations which are “extreme” for the members of the species or the culture. Thus the acts of man may be viewed as degrees of approximation to murder, suicide, and incest. Each sense in which the tendency conception is used is valid and useful for certain purposes, and is exposed to characteristic liabilities to error. Thus if we accept the man’s statement that he is running to catch a train, we may be wrong; he may be running to the woods beyond to escape the constable. The reactive type of statement is an alternative (I should prefer to say a supplement) to tendency generalizations. When we make a reactive statement, we specify quite definitely the antecedent-consequent relation to which reference is made. The specific stimulus-response description of the events which elicit the knee jerk, or call out an avoidance reaction to yellow cloth, illustrates what is meant here. Of course the stimulus-response style of thinking is not nearly as exhaustive, and the tendency style of thinking is not nearly as ambiguous in actual application, as might appear at first glance. The stimulus-response statement of how to elicit the knee jerk which is usually given may be predictively valid in eight cases out of ten; but there are “exceptions” which show how wide is the context of factors which it would be necessary to include in the picture, were it nearly complete. And when the stimulus-response mode of thinking is extended from such relatively stable and touchable situations to those which involve complex central (subjective) events in the sequence, it becomes in reality a disguised form of tendency interpretation.