The seventh edition of this classic second language acquisition (SLA) text provides an overview of the theoretical foundations of language teaching. This new edition has been updated to capture current research and practice in the field. Among concepts that are either redefined or entirely new are:Language learning in an era of globalization and multilingualismThe significance of transnationalism, identity, investment, agency, and ideologyLanguage learning as situated, usage-based, and socioculturally contextualizedThe importance of emotional engagement, intercultural sensitivity, and self-efficacy in language learningTransdisciplinary and ecological approaches as keys to language teaching in the 21st centuryThe seventh edition also retains useful historical information and foundational cornerstones of SLA that teachers have found beneficial in their instruction. Key principles continue to be presented and explained with direct application to classroom language education and real-life contexts. Features such as "Points to Ponder" (questions for readers' personal reflection), classroom connections and "Tips for Teaching," suggested readings, and a glossary of terminology are updated in this edition. With its reader-friendly style, practical pedagogical tools, and comprehensive coverage of state-of-the-art research findings, this edition serves as an essential resource for language teacher education programs worldwide, catering to the needs of both novice and experienced language teachers.