To date, no book exists that groups together the various written genres that business people need daily in their work. Students who want to develop their skills in writing Business English often receive an unstructured collection of information from diverse sources. This proves unsatisfactory for both teachers and students. This book aims to fill this gap. The units were selected based on actual feedback from students doing internships in companies. In addition, real information from student error analyses is included. The book is suitable for classroom use, self-study, and can also serve as a quick reference for business people wondering, "How do I do this again?" For each unit, an example is provided and analyzed; the user is then asked to simulate the model through various applications and exercises. Sample answers are available on the website. It focuses on language levels B2-C1.