This textbook is designed for non-native English speakers who need to write scientific and engineering research articles, technical reports, engineering thesis, academic books, and other technical documents in English. The author focuses on formal academic writing in a professional language and frame. The book is written in standard English and provides useful guidelines on development of thoughts, organization of ideas, construction of paragraphs and sentences, and choices of precise words. It also pays attention to details such as visual creation, punctuation, and format. Informal writing is excluded from the scope of this practical guideline.