In this original and distinctive book, Paul Robinson presents an integrated statement of the results of several years of criminal law theorising and of practical experience of working with and drafting criminal codes. It begins with an analysis of the existing structure of systems of criminal law in the Anglo-American tradition. This is followed by an exploration of the structure of criminal law in terms of its functions, identifying and elaborating the separate functions of articulating rules, establishing grounds of liability, and grading offences. The final part of the book develops some principles for drafting criminal codes using the insights gained, and two appendices contain actual drafts prepared on this basis. Anyone who has reflected on the organisation of the criminal law will find this a rewarding book which challenges assumptions and points new ways. For those charged with reform and/or codification of the criminal law, it sets out standards and distinctions which will command attention for many years to come. I am delighted that Paul Robinson has been able to write such a powerful book for the series.