The background to teacher effectiveness research -- Differentiated teacher effectiveness: framing the concept -- The range of teachers' work -- Historical models of teacher effectiveness -- Review of current research in educational effectiveness -- Towards a differentiated model -- A critique of teacher effectiveness research -- Developing a model of differentiated teacher effectiveness -- Evidence in support of differentiated teacher effectiveness -- Building theory and methodology -- Values and policy implications -- Effective teaching and values -- Differentiated teacher effectiveness and teacher appraisal -- Exploring policy implications -- Differentiated teacher effectiveness research: the model in practice -- A study of aspects ofdifferentitaed effectiveness