Based on the authors' research on the behaviour and thinking of school leaders, this volume presents arguments about the natue of expert school leadership. It parallels developments in the field from the early 1980s when the emphasis was on identifying the behaviours of effective principals, to the early 1990s, when the focus shifted to understanding the thinking underlying those behaviours. The ideas contained in this book should be useful in helping practising educationalists develop the skills involved in school leadership.