Mohan, G. (2015, April 6). Brain knows how to stop thinking, start learning. Retrieved January 24, 2017, from Los Angeles Times

D students can be a serious problem. Although they pass, they learn next to nothing along the way. A D student may do poorly on a major test assignment but make up for it with minor grades such as quizzes or bonus points. If Ds are markers of adequacy that everyone recognizes as inadequate, doling them out seems illogical and cynical.

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