This book also focuses on analyzing each trait from the point of view of its higher and lower order structure, as well as from the affective, cognitive, behavioral, social and academic perspectives, apart from outlining the field of personality psychology. Personality traits are important in daily interaction, and are a significant factor in achieving educational goals also for second and foreign language (L2) learners. Consequently, studying the role of personality in the field of second language acquisition (SLA) appears to be of primary importance, especially because there has been little research on this subject. Moreover, general results pertaining to the role of personality in L2 are inconclusive. This book’s primary objective is to present a concise and updated picture of personality on the basis of the Big Five model, which is accessible for non-psychologists. The middle part of the book focuses on discussing potential merits and drawbacks of each trait for the purpose of the process of SLA, both from the formal and informal, theoretical and empirical points of view. The next part includes a description of an empirical study, whose main aim is to sensitize the reader to direct and indirect influences that personality may exert on L2 learning. The book closes with a concluding chapter aiming at clarifying directions for further empirical study of personality as well as issues in research methodology.