This book attempts two interrelated tasks. The fi rst is to arrive at an understanding of practical knowledge and how expertise is related to it. The second is to show how such an understanding informs the various educational tasks of developing expertise. ‘Practical knowledge’ is understood in a broad sense of ‘knowing how’ rather than ‘knowing that’, as set out by Ryle1 and includes consideration of the moral aspect of knowing how to act, as well as what is known as practical judgement in the broader sense of being able to act rationally in practical contexts and includes consideration of ‘competence’, ‘skill’ and related terms. Declarative knowledge and knowledge.