Written by grades 6-8 teachers from Australia, England, and the United States, this volume captures the authors' involvement in research activities that had a profound impact on their conceptions of teaching and learning and an immediate, direct impact on practice. Chapters cover the questions examined in their research, the mathematics content through which they engaged their students in these explorations, and the data sources they used in their research. Classroom research is often used to back up theories and create and implement curriculum, but how well is the research process understood? This series, published in cooperation with Information Age Publishing, sheds light on the processes of classroom research, with teachers' accounts that capture the complexity and multi-faceted nature of teaching. With rich examples, the teacher researchers in these books demonstrate how they came to understand their students' reasoning processes and thus learned to intervene more adeptly with the right question, the right comment, a new problem or silent acknowledgement and support. The series showcases a variety of ways teachers can become engaged in research.