“…One way to accomplish this is by applying a "depth versus breadth" methodology to the design of the course. Advocates of this view hold that some fundamental concepts are more essential to in-depth understanding than others and that focusing on these "core competencies" in lieu of covering a broader inventory of less important ancillary topics is a more productive teaching pedagogy (see, for example, Hirsch, 2001;Parker et al, 2011;Proust, 2012;Schwartz, Sadler, Sonnert, & Tai, 2009). Related research into what improves memory of a subject corroborates the notion that an increase in depth, namely, spending more time on fewer concepts, results in higher retention (Sadler & Tai, 2001;Shan, 2013).…”