This book is a collection of eight research papers that tackle various issues in the area of second language learning, followed by a discussion of the pedagogical aspects of these theoretical issues. Such a discussion is based on the findings and the analysis of the data reported in these studies. (1)Bidirectional Influence between Languages: Theoretical Foundations and Pedagogical Implications (2)L2 Learners' Performance in Three Language Skills: Focus on Sex-Related Differences (3)L2 Learners' Performance in Multi-Dimensional Tasks: A Psycholinguistic Perspective (4)On the Phenomenon of...