Critics of the English law of evidence have often claimed that the rationales for various rules are explicable only in terms of historical conditions long superseded, that it has failed to adapt to changing social and technological developments, and that frequently the results of applying it defy common sense. The hearsay rule and its exceptions have been subjected to all these criticisms and more. The topic was considered by the Criminal Law Revision Committee in its Eleventh Report in 1972, and it is again under consideration, this time by the Law Commission. Dr. Choo's study goes deeper and wider than those enquiries, seeking to provide a more principled examination of the existing law and directions for reform than is possible in general texts and in committee reports. It is a timely contribution to a major debate.