The authors thank and acknowledge the contributions of Joyce Parker (for help with item creation, rubric development, and interview protocol), Alexander Lyford and Jennifer Kaplan (for help with statistical testing and discussions about results), and Emily Norton-Henry and Matthew Berry (for help in expert scoring and conducting interviews). The work presented here was supported by the National Science Foundation (DUE 1022653). Any opinions, findings and conclusions expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Data collection for this project was approved by the Michigan State University Institutional Review Board (x10-577). Analytic resources used for lexical analysis that are described in this report, as well as information about the Automated Analysis of Constructed Response research project and help with TA, can be found at: www.msu.edu/∼aacr.