In some cases, Kogyokujuku and Dojinsha are excluded from the above-mentioned school group, to which other schools such as Tsuda College and the incorporated educational institution Nishogakusha are added, and the schools of the group are collectively referred to as 'the three great private schools.'
なお、津田塾大学や学校法人二松学舎などを攻玉塾や同人社と交換して「三大塾」と称する事例が散見される。