This volume brings together theoretical perspectives and empirical studies in second language (L2) acquisition and bilingualism and discusses their implications for L2 pedagogy. The book is organized into three sections that focus on prominent linguistic and cognitive theories and together provide a compelling set of state-of-the-art works. Part I consists of studies that give rise to innovative applications for second language teaching and learning and Part II discusses how findings from cognitive research can inform practices for L2 teaching and learning. Following these two sections, Part III provides a summative commentary of the theories explored in the volume along with suggestions for future research directions.