This document discusses content-based instruction (CBI), a method of language teaching where the content and language are taught together using themes or topics. CBI focuses on communicating meaning rather than language structure alone. The teacher acts as an expert in the subject matter and elicits knowledge from students, who are autonomous and active learners. Grammar is not taught independently, but as part of vocabulary and discourse. CBI has advantages like increased motivation and confidence for students, but also challenges like ensuring language levels are appropriate and finding suitable content sources.