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Collette, M. (2015, April 13). Why Schools Are Ditching A’s, B’s, and C’s for Greens, Yellows, and Reds. Slate Magazine. Retrieved February 22, 2023, from https://slate.com/human-interest/2015/04/standards-based-grading-why-schools-are-ditching-letter-grades-for-a-new-model.html

Durm, M. W. (1993). An A is not an A is not an A: A History of Grading. The Educational Forum. https://doi.org/10.1080/00131729309335429

Gonzalez, L. (2022, June 13). The History of Grading in the US – What...