This material is based on work supported by the National Science Foundation (NSF) Graduate Research Fellowship Program under grant no. DUE-1156974. 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. Thank you to Alison Crowe, Jennifer Momsen, and Jon Dees for reviewing the VBT, and to Miriam Ziegler for generously sharing some of her HOCS exam questions.