Geoff Jordan’s 30 Key Concepts in Second Language Acquisition is a user-friendly book, which provides a comprehensive overview of the research into second language acquisition (SLA). For each concept, the author answers three questions: What is it? What does the research say? What are the teaching implications? This structure supports you to develop your understanding of how students learn languages and apply the insights in your classroom. The book explores SLA as both a psychological and social process, considers the impact of individual differences and discusses the ways instruction affects learning.