This is an important book which explores the classification of obligations. This is a very topical subject and it is fitting that it is examined here by contributors who are among the best-known writers in this field. The contributions include A New 'Seascape' for Obligations: Reclassification on the Basis of Measure of Damages by Jane Stapleton; Basic Obligations by James Penner; and an essay by Peter Birks himself entitled, Definition and Division: A Meditation on Institutes. These essays combine practical and academic perspectives which usefully highlight contemporary trends in the law of obligations. The book will be a valuable addition to the libraries of all teachers involved in this area of law.