A/RES/55/283 be practicable, the consistency of the administrative operations of the two organizations in this field. 2. The United Nations may arrange for studies to be undertaken concerning budgetary and financial matters of interest to OPCW with a view, as far as may be practicable, to achieving coordination and securing consistency in such matters. 3. OPCW agrees to follow, as far as may be practicable, the standard budgetary and financial practices and forms used by the United Nations. Article XII Expenses Expenses resulting from any cooperation or provision of services pursuant to this Agreement shall be subject to separate arrangements between OPCW and the United Nations. Article XIII Protection of confidentiality 1. Subject to paragraphs 1 and 3 of article II, nothing in this Agreement shall be so construed as to require either the United Nations or OPCW to furnish any material, data and information whose disclosure could, in its judgement, require it to violate its obligation, under its constituent instrument or policy on confidentiality, to protect such information. 2. The United Nations and OPCW shall ensure the appropriate protection, in accordance with their constituent instruments and policies on confidentiality, in respect to such information. Article XIV Implementation of the Agreement The Secretary-General and the Director-General may enter into such supplementary arrangements and develop such practical measures for the implementation of this Agreement as may be found desirable. Article XV Amendments This Agreement may be amended by mutual consent between the United Nations and OPCW. Any such amendment, once agreed upon, shall enter into force on the date on which the United Nations and OPCW have exchanged written notifications that their internal requirements for entry into force have been met. Article XVI Entry into force 1. This Agreement shall enter into force on the date on which the United Nations and OPCW have exchanged written notifications that their internal requirements for entry into force have been met. 2. This Agreement shall be applied provisionally by the United Nations and OPCW upon signature. 7