In summary, this book proposes to establish controlled document authoring that enables contextual MT. To implement controlled document authoring, we orchestrated a wide variety of frameworks and methods covering document formalisation, CL, technical writing, and terminology management. From the practical viewpoint, controlled document authoring is difficult to deploy by non-professional writers. Therefore, we designed, implemented and evaluated an integrated authoring support system to help them write well-structured source documents that are not only easy to read but also easily translated by MT systems