There is little doubt that a learner's success in foreign language leaerning is influenced by many factors including the learners' personal traits such as self-efficacy, self-concept, and attitude. This book is dedicated to the investigation of the above-mentioned traits as predictors of EFL learners' course performance. Appart from a theoretical review of the related factors, the book also containes an empirical study and a detailed discussion of the results of the emipical analysis. This book can be of theoretical as well as pedagogical value for researchers as well as language learners and teachers.