by A. Berthoz The publication of this volume edited by Adriano Ferrari and Giovanni Cioni is a major event for several reasons. Most importantly it concerns an area of child pathology that has yet to be fully explored. In this context the authors efforts to compile their observations as well as those of other clinicians and to elaborate their theories have resulted in an ess- tial step in the field of cerebral palsy (CP). The originality of the book is its very clear focus while at the same time the authors have encouraged the book s contributors to express their ideas and personal opinions. This leads sometimes to redundancy but this is precisely one of the benefits of the book - cause the same problems are then exposed from different points of views. The reader is thus spared the normative attempts of many other pathology books in which the compl- ity of a given disease is hidden by the authors or editors desire to impose a rigid taxo- my or epidemiology.