This collection provides a comprehensive up-to-date synthesis of some of the most significant publications in the psychology of individual differences field over the past two decades. It contains benchmark readings, including highly cited empirical articles, review articles with an emphasis on critical review articles as well some book chapters that have had great impact in terms of presenting research findings and influencing the key debates in the field. There is a particular emphasis on recent key publications to complement older classic works, an overall integration of this expansive field and is thoroughly international in focus.In addition to the 80 key original publications included in the collection, Volume One opens with an introductory editorial essay by the Editors setting out the rationale behind the selections, and providing an illuminating discussion of the development of Individual Differences and its theoretical, empirical, and applied foundations. Volume 1 covers the role of individual differences in cognitive/intellectual abilities; Volume 2 covers theories pertaining to normal personality structure along with associated measurement instruments; Volume 3 covers papers published on cognitive, emotional and motivational influences on the area of individual differences; Volume 4 covers clinical and applied research - including papers in the huge area of personality disorders and assessment. This 4-volume reference set will make an invaluable addition to any academic library with a interest in and/or existing collection in individual differences/personality.Given its diverse yet coherent organization, it ought to provide an excellent supplement on relevant courses where students need to engage with the provocative ideas that have made this field both lively and fascinating. This collection provides a comprehensive, up-to-date and international synthesis of some of the most significant publications in the psychology of individual differences over the past two decades. It contains: benchmark readings, including highly cited empirical articles; review articles with an emphasis on critical review articles; and key book chapters that have influenced debates in the field. The Editorial introduction at the beginning of Volume 1 contextualises the articles in terms of their overall significance in the development of the field. The book serves as a unique resource for students and researchers interested in the theoretical, empirical, and applied foundations of the psychology of Individual Differences.