Citable items are part of the calculations used to create the Journal Impact Factor of academic publications.
Citable Items: The Contested Impact Factor Denominator
"Teaching Score’ (TS) is a numerical indicator of the frequency with which a particular work is taught. Overall Teaching Score is based on the rank of the text among citations in the total collection;"Top 3 textbooks for Business:
From the press release:
The 2015 release, with 2014 citation data for literature within the sciences and social sciences, features 11,149 journal listings in 237 disciplines; 82 countries are represented. A total of 272 journals received their first JIF; 53 percent of journals saw an increase in JIF from last year and 43 percent saw a decrease. Additionally, 39 journals were suppressed to ensure the integrity of the reports. Suppressed journals are re-evaluated after a year for reconsideration in the JCR.