'The book has a place in undergraduate libraries because of its uniquely comprehensive, if theoretical, treatment of a timely, widely important subject. Recommended.' D. V. Feldman, Choice 'The authors have produced a well-written, organised and comprehensive account of three important type systems. These systems' properties have been rich sources of interest to logicians for many years; their problems are not ... Read moreall solved, and in future work this book will almost certainly become a standard reference about them. It will also allow the more mathematically inclined computer scientist to obtain a deeper understanding of the principles behind some of the higher order languages in current use.' Bulletin of the London Mathematical Society The book has a place in undergraduate libraries because of its uniquely comprehensive, if theoretical, treatment of a timely, widely important subject. Recommended. D. V. Feldman, Choice The authors have produced a well-written, organised and comprehensive account of three important type systems. These systems' properties have been rich sources of interest to logicians for many years; their problems are not all solved, and in future work this book will almost certainly become a standard reference about them. It will also allow the more mathematically inclined computer scientist to obtain a deeper understanding of the principles behind some of the higher order languages in current use. Bulletin of the London Mathematical Society Show Less