In this session, we share ongoing work to develop instruments to assess secondary teachers’ mathematical habits of mind (MHoM). We envision MHoM as a critical component of mathematical knowledge for teaching. Moreover, many of the eight Mathematics Teaching Practices in NCTM’s Principles to Actions depend on teachers’ MHoM for implementation. We are investigating the research question: What are the MHoM that secondary teachers use, how do they use them, and how can we measure them? The focus of the session is on our paper and pencil (P&P) assessment that measures how teachers use MHoM while doing mathematics on their own. Session participants will engage in working through the P&P items, rubrics, and sample teacher responses. Participants will also have an opportunity to share questions, concerns, and reactions to the items. The discussion will center on the challenges of validity, reliability, scoring, and use of the P&P assessment.

Session Type: Discussion Session