There are so many good textbooks in the field of this sense the book is more comparable to modern human psychology that anyone producing a new one textbooks of 'harder' sciences such as physics and must have a good excuse, ready to explain his physiology. Theories are considered important, but temerity. Our reason for bringing together the various only theories that are scientific in the sense that they authors who have contributed the chapters of this continuously interact with empirically derived facts. book is a very simple one. Most textbooks are written Theories which seldom make contact with facts (e. g. just for future professional psychologists, i. e. for Jung's theory of archetypes) are generally ignored. students who are going to adopt psychology as their There is one other point about which we would like to be explicit. Textbooks often state different theories life's work, and whose main area of concentration is psychology. These students are, of course, a very im­ regarding a particular phenomenon, or set of phenom­ portant group, yet psychology is becoming more and ena, without giving any opinion as to which of these more important to professionals in other fields as well theories might be judged superior to the others.