ABSTRACT
The history of applied psychology may be considered hitherto as a “neglected” area. The pressure of society and its new demands went much further than that. They required new concepts and techniques, and a theoretical widening of the previous intellectual frame. The background to the new practical attitude was basically determined by the psychology of individual differences. Research in educational psychology seemed well consolidated in the early years of the 20th century. Human behavior has an endless variety of forms, origins and development courses, each of them with specific characteristics of their own. F. Galton stressed the importance for mankind of such a treasure of variations. Theoretical psychology was born under the pressure of scientific queries, while applied research developed under personal demands presented to psychologists. Applied interventions, produced under social demand, were based on problem data and the characteristics of each case.
