What is organizational psychology ? It is the " study of interplay of men and organizations " replies Bass ( 1965 ) ( 1 ) .Peter Wessenberg ( 1971 ) ( 2 ) delined it as ( The study of human behavior organizations " . Organizational psychologists today concern themselves with series of questions that deal not so much with the behavior of individuals as with the behavior of groups subsystems and even the total organization in response to internal and external stimuli " Seein ( 1980 ) ( 3 ) . oto1