This system was based on Tsubono's idea that "a good teacher is needed to raise a good person", and Tsubono had ordered Shishigaku to evaluate by five levels the degree of "goodness" of all 400 teachers in the city and to secretly report the result.
この制度は、坪野の「善人を育てるのは善人の教師が必要だ」という考えに基づくものであり、坪野は市視学に対し、市内の全教師400人の「善人」の程度を五段階で評価して内密に報告するよう命じていた。