The present book is Third Revised Edition for the Degree level. This book contains the pictures of all the psychologists mentioned under different units and also the pictures of noted institutes in the field of psychology. Some of the emerging areas have also been added. A sincere attempt has been made to give some information about development of the field of Psychology in India. The book is useful to students who have opted psychology as special paper in KAS and IAS examinations. For further information the students and our esteemed colleagues can mail the author. Any relevant suggestion is also welcome. I am deeply indepted to my friend and former colleague Mrs. Padma Rao for all the valuable suggestions, support and encouragement while writing this book. I am thankful to my dear students who helped me in collecting the pictures of psychologists and even for taking the interest in drawing some of the diagrams. Contents: Introduction to Psychology; Biological Foundations of Behaviour; Cognitive Processes: Sensation and Perception; Learning; Memory; Individual Differences in Intelligence; Motivation and Emotion; Thinking; Personality; Altered States of Consciousness.