'This fourth edition of Cooper's classic book is the most comprehensive and detailed description of the history, theory, research and applications from the diverse field of individual differences and personality. It will be the primary reference book until the next edition.' ? Don Saklofske, University of Western Ontario, Canada

'This book is the reason why I have never considered writing an introduction to individual differences and personality. Cooper?s volume can take the interested reader from zero knowledge to Master?s level expertise in the field. I am delighted to be able to recommend this latest, fully updated edition to anyone interested in differential psychology and its methodologies.' ? K. V. Petrides, University College London, UK

'A comprehensive update of an already essential text for psychology students. This new edition reflects current trends in the field from Cooper?s own critical lens.' ? Professor Robert Vaughan, York St John University, UK

'This text contains a breadth and depth of information not typically provided by related texts; it will be a welcome addition to students (and educators) studying or working in this field.' ? Dr Thomas Hunt, University of Derby, UK

Colin Cooper lectured in Psychology at Queen?s University Belfast for 20 years before emigrating to Canada. He is the author of several books on personality, intelligence and psychological measurement and of numerous research articles. He was elected president of the International Society for the Study of Individual Differences from 2021-2023.