Background and purpose: The article reviews studies that focus on the professional development of teachers after they have completed their basic teacher training. Teacher professional development is defined as teachers' learning: how they learn to learn and how they apply their knowledge in practice to support pupils' learning. The research…

It is sometimes suggested that activity theory represents the most important legacy of Soviet philosophy and psychology. But what exactly "is" activity theory? The canonical account in the West is given by Engestrom, who identifies three stages in the theory's development: from Vygotsky's insights, through Leontiev's articulation of the…