ABSTRACT
With regard to this type of psychology, or these "ecological ways" of approaching psychology, he saw his task as that of guiding the practice and the relationship between ''theoretical social psychology" and "applied social psychology" (Lewin, 1951, pp. 168-169). More specifically, this concerned the relationship between research primarily guided by intentions of "internal relevance", that is, aimed at increasing knowledge in the field of psychology and by research defmed as "applied", since it is primarily the interest of areas outside psychology, that is, with aims of "external relevance". Applied psychology in general focuses on problems of clear social relevance. These are identified and defined outside the field of psychology itself and they are in general intended to more or less directly understand and influence the processes of social organization, management and policy.
