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belief that they will contribute to the maintenance of effective liaison between the two organizations. They affirm their intention of taking whatever further measures may be necessary to make this liaison fully effective.
2. The liaison arrangements provided for in the foregoing articles of this agreement shall apply as far as appropriate to the relations between such branch or regional offices as may be established by the two organizations as well as between their central machinery.
Article XX
Implementation of the Agreement
The Secretary-General and the Director-General may enter into such supplementary arrangements for the implementation of this Agreement as may be found desirable in the light of the operating experience of the two organizations.
Article XXI
Revision
This Agreement shall be subject to revision by agreement between the United Nations and the United Nations Educational, Scientific, and Cultural Organization, and shall be reviewed not later than three years after the Agreement has come into force.
Article XXII
Entry into Force
This Agreement shall come into force on its approval by the General Assembly of the United Nations and the General Conference of the United Nations Educational, Scientific, and Cultural Organization.