The document discusses the functional-notional approach to language teaching. It describes the historical background and basic claims of the approach. The functional-notional approach focuses on the communicative purposes and functions of language use. It emphasizes learning language through real-world functions like greetings, requests, apologies rather than through grammar rules. The approach is based on the idea that language learning should involve understanding functions, notions (vocabulary related to functions), and exponents (language forms used to express functions). It aims to help learners communicate effectively for different purposes.