The document discusses the origins and development of English for Specific Purposes (ESP). It traces ESP back to three main factors after WWII: 1) the rise of English as the international language of technology and commerce, 2) a revolution in linguistics focusing on how language is used in real communication, and 3) recognizing that learners have different needs and interests. ESP developed through different stages, shifting from a focus on language forms to skills, strategies, and ultimately a learning-centered approach. The document emphasizes that ESP is an approach rather than a product, where content and methods are based on learner needs and purposes.