A perspective is an approach that involves certain assumptions about human behavior, the way they function, which aspects of them are worthy of study, and what research methods are appropriate for undertaking this study. Sometimes people wonder why there are so many different psychological perspectives and whether one approach is correct and others wrong. Most psychologists would agree that no one perspective is correct, although in the past in the early days of psychology, the behaviorist would have said their perspective was the only truly scientific one.