A new international forum has emerged in the last decade, with the function of reviewing the implementation of certain arms control agreements. Four agreements, negotiated between 1968 and 1978, provide for the convening of periodic conferences of states parties “to review the operation” of the treaty, including an examination of whether the purposes of the preambles and the provisions of the treaties are being realized. These conferences are completely divorced from the procedures for amendment of the treaties. Instead, they are concerned with the implementation and interpretation of the agreements. Conferences to revise multilateral agreements are rare events probably because of the natural concern that reopening the text of a treaty may cause the entire agreement to unravel. In contrast, conferences to review the operation of treaties have become a common part of the diplomatic environment. They constitute a new type of enforcement mechanism for international law, though their activities have virtually been ignored in the literature. This neglect may be due to the fact that while the agreements calling for review conferences date from the 1970s, most such conferences have only met in the 1980s.