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 a thoroughly international focus.