The Handbook was revised by a group of international experts representing all the main legal systems and regions, which met in Vienna on 24 and 25 May 2007. UNODC wishes to acknowledge the significant contributions made to the Handbook by the experts participating in that meeting: Alvaro A. Burgos Mata, Birgitta Engberg, Chris Graveson, Amod Kanth, Michel Lorcy, An Michels, Sharon Morris-Cummings, Jean-François Noël, Julia Sloth-Nielsen and Renate Winter. Amanda Melville and Anne Grandjean of the United Nations Children s Fund provided extensive input to the Handbook during the drafting and revision process, as did Nadja Pollaert, Director of the International Bureau for Children s Rights. Claudia Baroni and Anna Giudice Saget of UNODC guided the Handbook through to publication.