In this essay I present the results of a national study of over 2,000 writing assignments from college courses across disciplines. Drawing on James Britton’s multidimensional discourse taxonomy and recent work in genre studies, I analyze the rhetorical features and genres of the assignments and consider the significance of my findings through the multiple lenses of writing-to-learn and writing-in-the-disciplines perspectives. Although my findings indicate limited purposes, audiences, and genres for the majority of the assignments, instructors teaching courses explicitly connected to a Writing Across the Curriculum program or initiative assigned the most writing in the most complex rhetorical situations and the most varied disciplinary genres.