The decision to designate part of Shenzhen, Zhuhai and Shantou cities in Guangdong Province and of Xiamen City in Fujian Province as experimental special economic zones was contained in the July 15, 1979 ``Approval by the Central Committee of the Chinese Communist Party and the State Council for Distribution of the Two Respective Reports of the Guangdong and Fujian Provincial Party Committees Concerning the Adoption of Special Policies and Flexible Measures in External Economic Activities'' and the May 16, 1980 ``Written Instructions of the Central Committee of the Chinese Communist Party and the State Council Concerning the `Summary of the Meetings of the Guangdong and Fujian Provincial Authorities'¥''. While keeping to the principle of preservation of China's sovereignty and the enforcement of China's laws and decrees, a policy of opening to the outside world is implemented in economic activities in these special economic zones, with the purpose of attracting investment in the building of factories by both overseas Chinese and foreign businessmen, launching joint ventures with them, introducing advanced technology and expanding foreign trade.