The second stage is from 1979- 1982, about 4 years. Its basic feature is 12: strengthening foundation, developing intelligence and cultivating ability.
The third stage is from 1983- 1989, about 7 years. Its basic feature is 15: strengthening foundation, developing intelligence and cultivating non-intelligence factors.
The fourth stage is 1990. Its basic characteristics can be summarized as 23 words: strengthening foundation, developing intelligence, cultivating non-intelligence factors and improving students' quality in an all-round way.