This book starts from the observation that criminal law is different in each of the EU's Member States: (1) what constitutes as an offense in one Member State does not necessarily constitute as an offense in another member state; (2) where offenses are equally criminalized in all Member States, the sanction levels may still vary; and (3) more generally, the position of the offenses in the entirety of the justice system may vary. The question arises: to what extent are those so-called offense diversities an obstacle for EU policy making and to what extent is it feasible to overcome those obstacles? The book underpins the need for the development of an EU offense policy, using the common criminalization acquis as a center piece. It argues that the common criminalization acquis can help: to ensure comparability of crime statistics * to avoid redundant double criminality testing * to overcome evidence gathering difficulties * to clarify the mandates of the EU level actors * to identify the equivalent national sentence * to scope the taking account of prior convictions. The only condition: the development of a comprehensive, consistent, and well-balanced EU offense policy. This book contains the conclusions of author Wendy De Bondt's publication-based doctoral thesis defended at Ghent University in June 2012. It will be essential reading for policy makers, both at the national and European level, in any policy field that is linked to offenses.