Teaching English became a professional and academic field a half century ago. Many researches for teacher education and teacher training have been conducted in order to raise the English teachers as well as the foreign language teachers knowledge and capabilities in carrying out effective lessons in classrooms of English learning. During second millennium of speedily globalized world, teaching English as a common communication tool has become even more significant than two decades ago. For introducing the history, teaching methodologies, and pedagogies of teaching English as a Second/ Foreign Language, this book is composed as a reference for English teachers.