In this paper, we propose a controlled language for authoring technical documents and report the status of its development, while maintaining a specific focus on the Japanese automotive domain. To reduce writing variations, our controlled language not only defines approved and unapproved lexical elements but also prescribes their preferred location in a sentence. It consists of components of a) case frames, b) case elements, c) adverbial modifiers, d) sentence-ending functions, and e) connectives, which have been developed based on the thorough analyses of a large-scale text corpus of automobile repair manuals. We also present our prototype of a writing assistant tool that implements word substitution and reordering functions, incorporating the constructed controlled language.
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