In 2005, the Austrian government committed all schools to develop school policies supporting the learning of their students. One purpose of the paper is to seek evidence for the effectiveness of this governmental action. A second purpose is to suggest a special kind of multilevel model which can be applied to longitudinal data at the school level…

Introduction: Studies of school effect usually evolve around two major issues; understanding of the factors within schools that explain variation in students achievement levels, and how differences among schools account for the variation in their students' achievement levels. Given the limited studies of school effect research in South Africa,…