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…

School reform policies and school administrators are increasingly positioning teacher leaders (TLs) with the responsibility to facilitate professional learning for their colleagues. Although ample evidence exists to suggest the need for facilitators to be highly skilled for teachers' learning to be optimized, there is a dearth of research…