The Tendai sect of Buddhism groups teachings given by Buddha during his lifetime into 'Keho-no-shikyo' (Shakyamuni's four kinds of teaching of the content of the Truth accommodated to the capacity of his disciples) named 'zo, tsu, betsu, and en' (Tripitaka, common, distinct, and perfect).
天台宗における教学では、釈迦一代の教説（経典）を、「蔵・通・別・円」と「化法の四教」に分ける。