This material is based on work supported by the NSF under grant numbers DUE 1347578 and 1322851. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. We thank the instructors who participated in this study and the following individuals for providing feedback on the essay: Carolyn Aslan, Natasha Holmes, Peter LePage, Kelly Nielson, Melissa Pirkey, and Lisa Sanfilippo.