COSI facilitates, promotes and strengthens coordination of EU member states' operational actions related to the EU's internal security. COSI consists of high-level officials from each EU member state's Ministry of Interior and/or Justice, as well as Commission and EEAS representatives. Europol, Eurojust, Frontex, CEPOL and other relevant bodies may be invited to attend the meeting as observers.
The committee supervises the planning, coordination, governance and oversight of major IT systems and projects operated by the General Secretariat of the Council, which link it to member states and other EU institutions, agencies or bodies. It is chaired by a representative of the General Secretariat of the Council. The Committee also meets in a technical expert formation (CCCIS (TECH)).