This book, "The Psychology of the Language Learner: Individual Differences in Second Language Acquisition" by Zoltán Dörnyei, provides a comprehensive overview of individual differences (IDs) in second language acquisition (SLA). It covers topics such as language aptitude, motivation, cognitive styles, self-regulation, and personality traits. The book is valuable for researchers in applied linguistics and second language studies, as well as for language teachers and students of L2 pedagogy. Dörnyei aims to summarize variables contributing to IDs in SLA, clarify theories, define measurable constructs, and describe instruments used to assess these differences. He also argues that IDs are related to core issues in applied linguistics and can be linked to SLA processes. The book reviews the history of IDs in psychology and SLA, presents a taxonomy of IDs, and discusses various IDs in depth, including personality, temperament, mood, language aptitude, motivation, learning styles, and self-regulation. It also touches on other IDs such as anxiety and creativity. The final chapter discusses the situated nature of L2 learning and calls for more complex theoretical models and qualitative methods in ID research. Dörnyei critiques past research, posing difficult questions that may spark debate. For example, he challenges the interpretation of Gardner's theory of L2 motivation and questions the existence of learning strategies. He also highlights issues with existing strategy questionnaires and promotes the monitoring of students' self-regulation. While some may find Dörnyei's critiques oversimplified or controversial, the book is a valuable resource for graduate students and researchers in the field. It enriches our understanding of IDs in SLA and is highly recommended as a textbook or reference.This book, "The Psychology of the Language Learner: Individual Differences in Second Language Acquisition" by Zoltán Dörnyei, provides a comprehensive overview of individual differences (IDs) in second language acquisition (SLA). It covers topics such as language aptitude, motivation, cognitive styles, self-regulation, and personality traits. The book is valuable for researchers in applied linguistics and second language studies, as well as for language teachers and students of L2 pedagogy. Dörnyei aims to summarize variables contributing to IDs in SLA, clarify theories, define measurable constructs, and describe instruments used to assess these differences. He also argues that IDs are related to core issues in applied linguistics and can be linked to SLA processes. The book reviews the history of IDs in psychology and SLA, presents a taxonomy of IDs, and discusses various IDs in depth, including personality, temperament, mood, language aptitude, motivation, learning styles, and self-regulation. It also touches on other IDs such as anxiety and creativity. The final chapter discusses the situated nature of L2 learning and calls for more complex theoretical models and qualitative methods in ID research. Dörnyei critiques past research, posing difficult questions that may spark debate. For example, he challenges the interpretation of Gardner's theory of L2 motivation and questions the existence of learning strategies. He also highlights issues with existing strategy questionnaires and promotes the monitoring of students' self-regulation. While some may find Dörnyei's critiques oversimplified or controversial, the book is a valuable resource for graduate students and researchers in the field. It enriches our understanding of IDs in SLA and is highly recommended as a textbook or reference.