Many older persons have complaints or engage in behaviors that may be symptomatic of breakdown either in the individual or in his social system or in both. Such indices of dysfunction occur in many who never break down, and, in fact, this group of older people far exceeds the few who experience severe mental and behavioral disturbances. The problems of these individuals are real and as appropriate a treatment target as those of people who are severely upset. For example, the usual social cry is to eliminate poverty because it leads to stress, which in turn leads to mental breakdown. A more valid argument is to eliminate poverty because it leads to problems whether or not breakdown follows.In dealing with behavior, traditional psychology and psychological treatments have addmsed themselves either to a person's biological capabilities or to his attitudes. Even where some psychologists have emphasized the multiple causation of behavior, they have treated the individual rather than his world and have viewed problems as either situationally or historically determind, rather than from a developmental perspective.Psychology must now begin to go beyond man into his world. The new necessity of treating the aged has added a developmental dimension to intervention techniques. In this chapter, we will discuss Leonard E. Gottesman received his PhD in personality and psychopathology from the University of Chicago in 1959. He is currently a senior research psychologist at the Philadelphia Geriatric Center, and also serves as President of the Division of Adult Development and Aging of the American Psychological Association. His major research interest centers on the social/ psychological treatment of the aged.