The document discusses the principles of communicative language teaching (CLT). It describes CLT as focusing on developing students' communicative competence rather than just grammatical rules. Key aspects of CLT include interaction between learners to negotiate meaning, experimenting with language in meaningful ways, and a tolerant approach to errors. The document also contrasts traditional and CLT approaches, outlines typical CLT classroom activities, and discusses processed-based and product-based directions in current CLT methodology like content-based instruction, task-based instruction, and competency-based instruction.