This book is more than a series of related chapters. It has been produced collectively. Each chapter, including those ascribed to individuals has been worked on co-operatively. First of all then we want to thank each other for the constant support, open exploration and prompting. Without this we could not have got as far as we have. We are also particularly indebted to Stuart Hall, David Ingleby and Martin Richards for much needed encouragement and helpful criticisms, and to Robin Lister for his considerable editoral effort in helping us to clarify and articulate our arguments, as well as tidying up the scripts. We thank Mary Ann Kernan for her general editorial support and patience, and Francesca Ashurst and Jane Kendrick for giving up valuable time to help with the typing and the index. Many friends have listened to what we were trying to say and helped us to say it better.