Some examples of the conceivable problems are how the books were published from the transcription data left by Christians, from which data were the books published, and which contents took precedence or how they differed in the Japanese script version and the Roman script version of Jesuit Mission Press that were published based on the same original book.
たとえば、キリシタンが遺した写本資料からどのように、またどれをもとにして出版したのか、同じ原書に対してローマ字本と国字本がある場合どちらの内容が先行し又どのように違うか、ということが考えられる。