This document provides an introduction to the Technical English: Vocabulary and Grammar textbook. It describes the contents and structure of the book, which contains 50 topics divided into vocabulary and grammar sections. Each topic presents language forms on the left page through sample sentences, explanations and examples, while exercises and tasks to practice the language are provided on the right page. The book can be used for self-study or in the classroom to supplement an English coursebook. Users are advised to work through the language presentation and then complete the exercises, checking answers using the key provided.