In Myogyodo (the study of Confucian classics) and Kidendo (Literature), based upon their own interpretations, the Sugawara clan, the Oe clan, and the Kiyohara clan, and so on differently inserted 'okototen' used as markings for reading Chinese classics (kuntenho), which they made their family's theory used to teach their children or students.
明経道・紀伝道（文章道）においては、漢文の注釈（訓点法）に用いる乎古登点（乎古止点）を菅原氏・大江氏・清原氏などがそれぞれ独自の解釈で打っていき、これを家説として子弟や門人の教育に用いるようになった。