We examine how teacher leaders (TLs), working in a low-income urban elementary school, supported their colleagues to learn how to collect quality formative data and to discuss it in collaborative conversations in order to make their students' learning visible. The TLs faced challenges reflecting consequences resulting from the district's high…

In this article we chronicle a particular professional development initiative designed to promote the acquisition of an evaluation habit of mind within an educational context. After describing the rationale behind this initiative in some detail, we proceed to map the experiences of four of the participants--a principal, a vice principal, a…