1 Korean as a Second/Foreign Language (KSL): An overview; PART I: The acquisition of Korean as a second language; 2 Second Language Learning of Polysemous Korean Words; 3 Phonological Acquisition; 4 Linguistic Politeness; 5 KSL Syntax and Semantics; 6 Relative Clauses in Korean as a Second Language: Old and New Findings; PART II: Teaching and learning Korean as a second language; 7 Pragmatic Teaching and Learning; 8 Task-Based Language Teaching in Korean Classroom Contexts: Promoting Learner Engagement during Task Performance; 9 Instructional Technology in KSL Settings; 10 Culture in Korean Language Teaching: Focusing on a Dynamic View of Culture; 11 Korean for Specific Purposes; 12 Content-Based Instruction in KSL Settings; 13 Community Service-Learning in Korean; PART III: Approaches to Korean as a second language; 14 Corpus-Based Research and KSL; 15 Conversation Analysis for KSL: Teaching and Learning Sequence Organization; 16 The Intersection of Discourse, Grammar, Register, Pragmatics, and Culture; 17 Error Analysis; 18 Social Interactions in KSL settings; 19 National Standards and Korean as a Second Language; 20 Usage-Based Approach to Grammar in Korean Language Teaching and Learning; PART IV: Individual differences and social factors; 21 Individual Learner Differences in Learning Korean as a Second Language; 22 Korean as a Heritage Language; 23 Language Ideologies and Identity Formation among KSL Learners; 24 Instructor Individual Characteristics in a KSL/KFL Setting: A Research Perspective; PART V: Assessment; 25 KSL Assessment: The TOPIK, Achievement Tests, and Research Trends; 26 Integrated Performance Assessment and KSL; 27 Interactional Competence in Korean and its Assessment