Book excerpt: "The rules of the world are changing. It is time for the rules of teaching and teachers' work to change with them." This is the challenge which Andy Hargreaves sets out in his new book on teachers' work and culture in the postmodern world. Drawing on his current research with teachers at all levels, Hargreaves shows through their own vivid words what teaching is really like, how it is already changing, and why. He argues that the structures and cultures of teaching need to change even more if teachers are not to be trapped by guilt, pressed by time and overburdened by decisions imposed upon them. Provocative yet practical, this book is written for teachers and those who work with teachers, and for researchers who want to understand teaching better in the postmodern age.