Part 1: The background to teacher effectiveness research 1. Differentiated teacher effectiveness: Framing the concept 2. The range of teachers' work 3. Historical models of teacher effectiveness 4. Review of current research in educational effectiveness Part 2: Towards a differentiated model 5. A critique of teacher effectiveness research 6. developing a model of differentiated teacher effectiveness 7. Evidence in support of differentiated teacher effectiveness 8. Building theory and methodology Part 3: Values and policy implications 9. Effective teaching and values 10. Differentiated teacher effectiveness and teacher appraisal 11. Exploring policy implications Part 4: Differentiated teacher effectiveness research: The model in practice 12. A study of differentiated effectiveness