The Committee of Experts on the Operation of European Conventions on Co-operation in Criminal Matters (PC-OC) works under the authority of the European Committee on Crime Problems (CDPC). It meets for its plenary meeting twice a year.

The PC-OC monitors the application of the Council of Europe conventions related to international co-operation in criminal matters (in particular extradition, mutual legal assistance and transfer of sentenced persons), looks for solutions to practical problems raised and proposes new instruments in this field. It also produces helpful tools, such as country information, model forms, practical guidelines, etc. for practitioners who deal with these instruments.

The committee is composed of representatives of (mostly) the central authorities of the 47 member states of the Council of Europe and observers.

The PC-OC Mod is a working group established by the PC-OC with the task to further elaborate decisions taken or proposals made by the plenary in preparation of the next plenary meeting. The PC-OC Mod is composed of 7 members elected by the PC-OC and its Bureau (the Chair and the vice Chair of the PC-OC) and meets twice a year since 2006. All other PC-OC members may participate in the meetings of the PC-OC Mod at their own expense.