Classification of Buddha's teaching
The schools of Mahayana Buddhism developed several different schemes of doctrinal classification (Chinese: 教判, pinyin: "jiàopan", Japanese: "kyōhan", Korean:교판, RR: "gyopan"). History. The classification of Buddha teachings is discussed very early by Mahayana Buddhists in China. In 600 AD there were 10 main classifications. And it continued to develop. Kukai in Japan wrote Himitsumandara jūjūshinron (祕密曼荼羅十住心論, Treatise on The Ten Stages of the Development of Mind) and Enchin also wrote his classification. Tibetan Buddhists also developed different classifications. Five Periods and Eight Teachings. Zhiyi of the Tiantai school categorized the Buddha's teachings in  the Mohe Zhiguan (摩訶止觀) and Fahua Xuanyi (法華玄義). These are classed under what are now known as the "Five Periods and Eight Teachings" (五時八教). The Five Periods are as follows: The Eight Teachings are subdivided into two groups: Tiantai followed this classification. Five Divisions and Ten Schools. Fazang wrote Huayan Yisheng Jiaoyi Fenqi Zhang (華嚴一乘教義分齊章) in which he classified Buddhist teachings into "Five Divisions and Ten Schools" (五教十宗). The Huayan school followed this classification. Nine yanas. There are nine yanas in Nyingma teachings.