The Routledge Handbook of Second Language Acquisition and Individual Differences provides a thorough, in-depth discussion of the theory, research, and pedagogy pertaining to the role individual difference (ID) factors play in second language acquisition (SLA).

Foreword Part 1 Introduction 1 Individual Differences in Second Language Acquisition: Theory, Research, and Practice Part 2 Cognitive Differences 2 Explicit and Implicit Language Aptitudes 3 Working Memory 4 Declarative and Procedural Memory as Predictors of Second Language Development 5 Learning Styles and Strategies 6 Metacognition Part 3 Conative Differences 7 Motivation 8 Mindsets 9 Goal Complexes 10 Willingness to Communicate Part 4 Affective Differences 11 Anxiety 12 Enjoyment 13 Self-Efficacy 14 Learner Beliefs Part 5 Sociocultural and Demographic Differences 15 Identity 16 Age Part 6 Individual Difference Factors for Aspects of Second Language Learning 17 Individual Difference Factors for Second Language Pronunciation 18 Individual Difference Factors for Second Language Vocabulary 19 Individual Difference Factors for Second Language Grammar 20 Individual Difference Factors for Second Language Pragmatics 21 Individual Difference Factors for Second Language Listening 22 Individual Difference Factors for Second Language Speaking 23 Individual Difference Factors for Second Language Reading 24 Individual Difference Factors for Second Language Writing Part 7 Research Methods 25 Surveys 26 Narrative Methods 27 Ethnography 28 Eye-Tracking 29 Psychometric Assessments 30 Measures of Implicit Attitudes 31 Methods for Complexity Theory in Individual Differences Research 32 Structural Equation Modeling and Factor Analysis

"This handbook provides an essential resource for all those interested in the role of individual differences in second language acquisition and pedagogy. With an emphasis on cutting-edge theory and research, it offers a comprehensive discussion of current issues and developments in this key area of SLA. The book is laudable for its depth of analysis and breadth of topics covered."Hossein Nassaji, University of Victoria, Canada​"This handbook is a treasure trove of information and inspiration. It does a remarkable job of covering all classic topics masterfully and offering truly innovative insights into individual differences in language learning that will move the field forward. A must-own resource for SLA researchers and language teachers alike!"Lourdes Ortega, Georgetown University, USA"Recent advances in science and technology have renewed researchers’ interest in the crucial roles individual difference factors play in second language acquisition. This brand-new handbook provides the most comprehensive and up-to-date state-of-the-science overview of the field, and its impact on second language acquisition as an interdisciplinary area of inquiry will be felt for a very long time to come."Li Wei, UCL Institute of Education, University College London, UK