SCI was established in 196 1. After 40 years of development and improvement, it has developed from a single printing type to a powerful electronic, integrated and networked large-scale multidisciplinary comprehensive retrieval system. What is SSCI? It is a social science citation index, a companion piece of SCI, and was also founded by institute for scientific information. It is a large-scale retrieval tool, which can be used to analyze the number of social science papers in different countries and regions. What is CSSCI? The Chinese Social Science Citation Index (CSSCI) successfully developed by Nanjing University is a key research project of the State and the Ministry of Education. The Ministry of Education has regarded CSSCI data as an important assessment index for the evaluation institutions and bases, achievement awards, project establishment and personnel training of colleges and universities nationwide.