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The novel utilization of paper-level classification system on the evaluation of journal impact: An update in CAS Journal Ranking

CAS Journal Ranking, a ranking system of journals based on the bibliometric indicator of citation impact, has been widely used both in selecting journals when submitting manuscripts and conducting research evaluation in China since its first release in 2004. This paper will mainly introduce the upgraded version of CAS Journal Ranking released in 2020 and the corresponding improvements. We will discuss the following improvements: (1) the CWTS paper-level classification system, a more fine-grained classification system, has been utilized for field normalization, (2) the Field Normalized Citation Success Index (FNCSI), an indicator which is robust against not only extremely highly cited publications, but also the wrongly assigned document type, has been used, and (3) document type difference is considered. In addition, this paper will present part of the ranking results and an interpretation of the features of the FNCSI indicator.