In the EU area of freedom, security, and justice, one of the main deficiencies is the lack of cross-country comparable data on crime and criminal justice. The importance of progress in this domain - especially in the context of the identification of best practices in the fight against crime - has been identified on several occasions. The main difficulty lies in the comparability of data or the guarantee that exchanged data is understood in the same way by all actors. In March 2007, the European Commission's Directorate-General for Justice, Freedom and Security launched a call for a "Study on the Development of an EU Level Offence Classification System and an Assessment of Its Feasibility to Supporting the Implementation of the Action Plan to Develop an EU Strategy to Measure Crime and Criminal Justice" (The Crime Statistics Project [CSP]). This book contains the final report of that Project. In the context of the project, the EU Level Offence Classification System (EULOCS) was created.