'Theoretical Issues in Stutteringis unique in several important respects. One peculiarity of the book is that theories of stuttering are not only described but systematically compared with respect to the criteria of testability, explanatory power, parsimony, and heuristic fruitfulness. In this way an integrated view on quite different theoretical approaches is systematically developed and described. Another singular feature of this book is that the first three chapters deal with philosophical questions behind theories of stuttering. In sum, this book is exceptionally clearly and comprehensibly written and provides insights into the philosophical background of stuttering theories, their development and evaluation.' Hans-Georg Bosshardt, retired member of Faculty of Psychology, Ruhr-University Bochum. 'This second edition of Theoretical Issues in Stuttering is much anticipated, given the ongoing profusion of models and theories about the cause of stuttering. This book is an indispensable guide to those wanting to know about current causal models and theories of stuttering and how to evaluate them, written by two authors with extensive experience of treatment, teaching, research and publishing about the disorder.

The first half of the book provides guidelines for evaluating theories, such as testability and explanatory value. The authors draw on philosophy of science and psychology to develop those guidelines. Seven new models and theories have been added to this edition, along with a new chapter about the evolution of theories.' Mark Onslow, Director, Australian Stuttering Research Centre, The University of Sydney given the ongoing profusion of models and theories about the cause of stuttering. This book is an indispensable guide to those wanting to know about current causal models and theories of stuttering and how to evaluate them, written by two authors with extensive experience of treatment, teaching, research and publishing about the disorder. The first half of the book provides guidelines for evaluating theories, such as testability and explanatory value. The authors draw on philosophy of science and psychology to develop those guidelines. Seven new models and theories have been added to this edition, along with a new chapter about the evolution of theories.

' Mark Onslow, Director, Australian Stuttering Research Centre, The University of Sydney.