The "Building a System of Tens Casebook" was developed as the key resource for participants' Developing Mathematical Ideas seminar experience. The thirty cases, written by teachers describing real situations and actual student thinking in their classrooms, provide the basis of each session's investigation of specific mathematical…

This case centers on a Black woman school administrator and efforts to disrupt Whiteness among an urban elementary school teaching staff. The case details the resistance she encounters while encouraging teachers to confront "White fragility" and consider how their fragile perspectives on race and racism shape how they educate Black…

History is alive! That is one of the important messages that teacher Barbara Knighton communicates to her students as she develops engaging stories about changes in farming, government, clothing, or transportation, using timelines as her basis. In this article, the authors describe how Knighton constructs social studies units for her first and…