Outcomes and findings from an evidence-based approach to targeting primary school students' developmental reading comprehension levels for effective learning are described. Nineteen schools participated in a literacy assessment project designed to monitor and improve the reading comprehension achievement levels of their students. The project integrated a developmental approach to learning and teaching, information derived from standardised reading comprehension assessments, and professional development for teachers. Reading comprehension achievement across the schools increased at a higher rate than typically expected. Teacher discourse about teaching and learning changed from discrete skill and resource focused, to developmentally focused. The centrality of a professional learning team approach to change for the student, teacher and school is discussed. (Contains 1 table and 3 figures.)