Reports an impact study of the Western Australian School Leadership Program, a development program for administrators. Questionnaires completed by 357 program participants and 287 colleagues indicated the impact of the training on leader behavior in schools. The effect was enhanced when several leaders from the same school had participated. (SLD)

This article reports key findings from a 2-1/2-year mixed methodological study of professional learning communities, the first of its kind in England. In particular, the concept of effectiveness is explored as it relates to professional learning communities. We describe three ways in which effectiveness can be construed, arguing that any…