This article is from the European Union FAQ, by Roland Siebelink & Bart Schelfhout with numerous contributions by others.
The Commission is a big organisation, whose tasks have been divided in
different departments or Directorates-General on the one hand, and some
supporting services on the other hand.
DG I External Economic Relations
DG IA External Political Relations
DG II Economic and Financial Affairs
DG III Industry
DG IV Competition
DG V Employment, Industrial Relations and Social Affairs
DG VI Agriculture
DG VII Transport
DG VIII Development
DG IX Personnel and Administration
DG X Information, Communication, Culture, Audiovisual
DG XI Environment, Nuclear Safety and Civil Protection
DG XII Science, Research and Development
DG XIII Telecommunications, Information Market and
Exploitation of Research
DG XIV Fisheries
DG XV Internal Market and Financial Services
DG XVI Regional Policies
DG XVII Energy
DG XVIII Credit and Investments
DG XIX Budgets
DG XX Financial Control
DG XXI Customs and Indirect Taxation
DG XXII Education, Training and Youth
DG XXIII Enterprise Policy, Distributive Trades, Tourism and
Cooperatives
DG XXIV Consumer Policy
Services
Secretariat-General of the Commission
Forward Studies Unit
Joint Research Centre
Inspectorate-General
Legal Service
Spokesman's Service
Joint Interpreting and Conference Service
Statistical Office (EUROSTAT)
Translation Service
Informatics Directorate
Security Office
European Community Humanitarian Office
Euratom Supply Agency
Office for Official Publications of the European Communities
Enlargement Task Force (TFE)
It might be worth pointing out that the relationship between the Commission
Members themselves and the staff of the European Commission is similar to
that between Government ministers and the permanent civil service, in the
sense that the former have no security of tenure, and inevitably with a
different number of Commission Members and DGs their portfolios don't
necessarily correspond directly to the DG structure.
 
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