技術文章力を高めるには,個別に添削指導を受けることが有効であるが,時間的な制約により実現が難しい.この問題に対処するため,書き手自身が短時間で何度も文章の客観的な見直しを繰り返し行い,さらに指摘の重要性や修正例を提示する校正支援手法により,学生の文章作成能力の向上に寄与できることを示した.また,学生の実験レポート2,285編から,140,214件の誤りを指摘した結果,学生に多い誤りは句読点および体言止めで79.4%を占めた.同時に,技術文章作成のノウハウを課題やレポートを通じて習得させることの重要性を改めて確認できた.There has been discussion about improving technical writing skills. Individual tutoring which a mentor provides a trainee to correct a technical writing might be the most effective way to enhance the skills. However it is difficult to repeat the tutoring many times because of time consuming job. We propose a method that an author oneself can emend a manuscript repeatedly. The method is based on a recommendation system which implements Japanese grammar and technical writing grammar with a morphological analysis. This paper describes the experimental results obtained from 2,285 reports written by students. The proposing method detected 140,214 technical writing errors in their reports. 79.4% of 140,214 errors are a punctuation mark and the indication of the termination with a substantive and speak that it is effective to teach these errors.