5. The decisions of the Tribunal shall be final and binding. ARTICLE 17 SPECIFIC UNDERTAKINGS 1. Member States shall respect the international character and responsibilities of SADC, the Executive Secretary and other staff of SADC, and shall not seek to influence them in the discharge of their functions. 2. In the performance of their duties, the members of the Tribunal, the Executive Secretary and the other staff of SADC shall be committed to the international character of SADC, and shall not seek or receive instructions from any Member States, or from any authority external to SADC. They shall refrain from any action incompatible with their positions as international staff responsible only to SADC. Chapter Six MEETINGS ARTICLE 18 QUORUM The quorum for all meetings of the Institutions of SADC shall be two-thirds of its Members. ARTICLE 19 DECISIONS Except as otherwise provided in this Treaty, decisions of the Institutions of SADC shall be taken by consensus. ARTICLE 20 PROCEDURE Except as otherwise provided in this Treaty, the Institutions of SADC shall determine their own rules of procedure. Chapter Seven CO-OPERATION ARTICLE 21 AREAS OF CO-OPERATION 1. Member States shall cooperate in all areas necessary to foster regional development and integration on the basis of balance, equity and mutual benefit. 2. Member States shall, through appropriate institutions of SADC, coordinate, rationalise and harmonise their overall macro-economic and sectoral policies and strategies, programmes and projects in the areas of co-operation. 3. In accordance with the provisions of this Treaty, Member States agree to co-operate in the areas of: a) food security, land and agriculture;