The Routledge Handbook of Second Language Research in Classroom Learning is a comprehensive psycholinguistic approach to the issue of instructed language learning that is uniquely theoretical, methodological, empirical, pedagogical, and curricular. Bringing together empirical studies with theoretical underpinnings, this handbook focuses on conceptual replications/extensions of, and new research on, classroom learning or Instructed SLA (ISLA). In chapters from leading experts, the Handbook reports on the tenets of several models that have postulated the roles of cognitive processes in the L2 learning process and also covers two major methodological data-elicitation procedures to be employed in addressing learner cognitive processes (think-aloud protocols and eye-tracking). With a dedicated interest in the role of this research in pedagogical ramifications, this handbook strives for deeper understanding of how L2 learners process L2 data in instructional settings.