Psychology: scientific study of behaviour and the factors influencing: behaviour = actions (observe directly) inner processes (mental events, causes: biological, individual, and environmental factors behaviour is complex and personal, . What"s the evidence? : are there other possible explanations? . Psychologists employ variety of research methods for developing and testing theories. Basic research quest for knowledge purely for its own sake: goals: describe how people behave identify factors that influence or cause particular type of behaviours research in lab or real world setting. Applied research designed to solve specific practical problems: uses principles discovered through basic research to solve practical problems. How do intergroup hostility and prejudice develop and what can be done to reduce them? (multicultural, racism keywords) : competition can breed hostility, conflict can be decreased by making groups depend on each other: principal applied to the multicultural school scene by psychologist elliot aronson and co in texas.