Secondary education in China has a complicated history. In the early 1960s, education planners followed a policy called "walking on two legs," which established both regular academic schools and separate technical schools for vocational training. The rapid expansion of secondary education during the Cultural Revolution created serious problems; because resources were spread too thinly, educational quality declined. Further, this expansion was limited to regular secondary schools; technical schools were closed during the Cultural Revolution because they were viewed as an attempt to provide inferior education to children of worker and peasant families.