Hypothesis is generally represented by "if"; Science is generally expressed by "logic".

It is valued by international peers and has a 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. Therefore, how to evaluate the basic research results is often simplified as how to evaluate the influence of the contents contained in the paper on the progress of scientific knowledge.

Impact:

Scientific citation index is based on Bradford's theory of document dispersion law and E. Garfield's theory of citation analysis, and through the statistics of citation frequency of papers.

Evaluate and study academic journals and scientific research achievements in many aspects, so as to judge the performance of scientific research output of a country or region, scientific research units and individuals and reflect their international academic level. Therefore, SCI is an internationally recognized scientific and technological literature retrieval tool worthy of reference.

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 citation frequency shows that this paper has had a great influence in its research field.