The purpose of this book is to fill a great public need regarding the subject of psychology, its many schools of ideas, and the terminology used in comprehending the study of human behaviour. The contents of this book bring the authority and clarity of science and the light of reason to a field that has remained too long in the darkness of confusion, misunderstanding and false belief. In place of guesswork and legend that so often pass for 'psychology' this book makes available to everybody, the general reader, the verified findings and most challenging theories of the world's great psychologists, philosophers and researchers. The depths of human behaviour need not remain perplexing and mysterious. So, this book is based on the conceptual understanding of psychology and the comprehension of the terminology of the many schools of ideas. Of all the world's mysteries, none is more baffling than man. As scientific knowledge advances, we are able to solve most unyielding problems concerning the world.