Country-wide educational change is difficult in Vietnam, due to the restrictive control of the government on social and economic development strategies. According to Hanoi government publications, the national system of education was reformed in 1950, 1956 and 1970. It was not until 1975 when the two separate education systems of the former North and South Vietnam territories became unified under a single national system. In Hanoi in December 1996, the Central Committee of the Communist Party of Vietnam stated that: "To carry out industrialization and modernization successfully, it is necessary to develop education and training strongly and to maximize human resources, the key factor of fast and sustained development."