The document discusses key concepts in language teaching methodology including approaches, methods, procedures and techniques. It provides definitions and examples of each. An approach is a set of assumptions about language and language learning. A method is the practical realization of an approach through various procedures and techniques. A procedure is an ordered sequence of techniques, while a technique refers to a single activity. Different language teaching methods like grammar translation, direct, audio-lingual and communicative language teaching are described in terms of their principles, techniques and roles of teachers and learners.