Originally published in 1983. A broad examination of the ways in which teachers gain and use knowledge about their work is presented in this book. At the time, within curriculum studies, there was a developing greater understanding of the major role that teachers play in the implementation of materials within the classroom - as autonomous agents holding, using and creating knowledge of particular kinds which informs all of their work. This book presents a case study using retrospective interviews with a high school English teacher. Through analysis of this series of interviews, this study describes and outlines the structure of the knowledge she uses and the views she has of her concerns.