Effective teacher professional development must include all 4 componen ts: • Knowledge – worthwhile research-informed theory, content, and expertise; • Integrated pedagogical and assessment skills and strategies; • Modelling, demonstrating, and engaging with approaches, ideally in settings that approximate to the workplace; • Practicing the approaches frequently over a substantial period of time between professional inputs; (2–6 months a minimum) with ongoing and follow up evaluation of impact and refinement; • Concurrent dialogue/coaching/peer collaboration in activities such as lesson planning, preparing related resources, peer observation, discussion, and reflection on impact