Gives you a unique 'hands-on' introduction to studying ESL learners' language using video interviews and footage of students doing language tasks. Uses linked exercises in the book to guide you through the stages of analysing learners' language. Provides full transcripts and an answer discussion section to help you to study and refer back to the input and explanations. Case study approach gives you the skills that will help you to explore learner language in your own classroom. Recommended for TESOL Masters and Diploma students and language teacher educators.