The chapter "Analysing Learner Language" by Rod Ellis and Gary Barkhuizen provides a comprehensive overview of various methods and techniques used to analyze learner language. The content is structured into several sections, including an introduction, methods for collecting samples of learner language, error analysis, obligatory occasion analysis, frequency analysis, functional analysis, examining accuracy, complexity, and fluency, interactional analysis, conversation analysis, sociocultural methods, qualitative data coding, critical approaches, metaphor analysis, and computer-based analyses. The chapter concludes with a bibliography and an index, offering a detailed guide to the field of analyzing learner language.The chapter "Analysing Learner Language" by Rod Ellis and Gary Barkhuizen provides a comprehensive overview of various methods and techniques used to analyze learner language. The content is structured into several sections, including an introduction, methods for collecting samples of learner language, error analysis, obligatory occasion analysis, frequency analysis, functional analysis, examining accuracy, complexity, and fluency, interactional analysis, conversation analysis, sociocultural methods, qualitative data coding, critical approaches, metaphor analysis, and computer-based analyses. The chapter concludes with a bibliography and an index, offering a detailed guide to the field of analyzing learner language.