The principal decision-making body for the Convention is the Conference of the Parties (COP) which meets once every three years. For most of the legally binding Agreements, instead of a COP, there is a Meeting of the Parties or MOP (the exception is the Wadden Sea Seals Agreement which is overseen by the Wadden Sea Board made up of representatives of the three Range States, Denmark, Germany and the Netherlands); the MOP meets every three or four years, depending on the provisions of each Agreement agreed by the Parties. MOUs have Meetings of the Signatories (MOS).