Educational researchers are accustomed to institutional review board (IRB) requirements (e.g., protecting participants) with students often identified as the only "vulnerable population" for IRB purposes. However, as practitioner research has gained more prominence, the vulnerability of teacher-researchers themselves has begun to…

This document contains the fifth volume of the proceedings of the 30th Conference of the International Group for the Psychology of Mathematics Education. Conference presentations are centered around the theme "Mathematics at the Centre." This volume features 59 research reports by presenters with last names beginning between Sac and Zaz:…