This is an important book which explores the classification of obligations. This is a very topical subject since the professions only started requiring Obligations in the compulsory core as recently as October 1995. 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.