1, Science Citation Index (SCI) is a periodical literature retrieval tool put into use by American Institute of Scientific Information (ISI) on 1960. Its publishing forms include printed periodicals, CD-ROM versions and online databases.

2. The Social Science Citation Index (SSCI) is an interdisciplinary academic citation index, which was developed by institute for scientific information (ISI) and is similar to the scientific citation index, and is the product of Thomson Reuters.

Extended data impact

Scientific citation index is based on Bradford's literature dispersion theory and E. Garfield's citation analysis theory. It evaluates and studies academic journals and scientific research achievements in many aspects by counting the cited frequency of papers, so as to judge the performance of scientific research output of a country or region, scientific research units and individuals and reflect its international academic level. Therefore, SCI is currently recognized as the most authoritative scientific and technological literature retrieval tool in the world.

With its unique citation approach and comprehensive scientific data, scientific citation index ranks journals and papers through the statistics of a large number of citations, and then obtains quantitative indicators such as impact factors, citation frequency and real-time index of a journal and paper in a certain discipline. The high frequency of citation shows that this paper has a great influence in its research field and has attracted the attention of international peers with high academic level. Because the papers included in SCI are mainly in the basic research field of natural science, SCI indicators are mainly suitable for evaluating the achievements of basic research, and the main achievements of basic research are academic papers.

References:

Baidu encyclopedia scientific citation index

Baidu Encyclopedia Social Science Citation Index