A/57/153 14. The efforts of the Centre in this area have been made possible by the support of several donors who pledged or made contributions. However, the capacity to provide pre-ratification and implementation assistance will be contingent upon continuous support by donor countries. In its resolution 56/120, the General Assembly renewed its call for adequate voluntary contributions to the United Nations Crime Prevention and Criminal Justice Fund to assist developing countries and countries with economies in transition in their efforts to ratify and thereafter implement the Convention and its protocols. V. Negotiation of the draft United Nations convention against corruption 15. Pursuant to General Assembly resolutions 55/61 and 55/188, an intergovernmental open-ended expert group to prepare draft terms of reference for the negotiation of a future legal instrument against corruption met in Vienna from 30 July to 3 August 2001. The Commission on Crime Prevention and Criminal Justice reviewed and approved the recommendations of the expert group at its tenth resumed session, held on 6 and 7 September 2001. The draft terms of reference were adopted by the General Assembly in its resolution 56/260. 16. The General Assembly decided that an ad hoc Committee should negotiate a broad and effective United Nations convention against corruption. It should meet in Vienna in 2002 and 2003, holding no fewer than three two-week sessions in each year, and should complete its work by the end of 2003. 17. Accordingly, an ad hoc committee held an informal preparatory meeting in Buenos Aires from 4 to 7 December 2001. From 21 January to 1 February 2002 and 17 to 28 June 2002, the Ad Hoc Committee for the Convention against Corruption held its first two sessions in Vienna, at which it began reviewing a consolidated text of the draft convention against corruption, completing its first reading. In conjunction with the second session, a one-day workshop on the question of asset recovery was held. 18. At the first and second sessions of the Ad Hoc Committee and the eleventh session of the Commission, Member States supported an effective, efficient and universal instrument. They expressed the view that it should be flexible and balanced, taking into account the legal, social, cultural, economic and political differences among countries. It was also stressed that the Convention should have a multidisciplinary and comprehensive approach, and should strike a balance between prevention and law enforcement and lead to improved international cooperation. VI. Preparations for the Eleventh United Nations Congress on the Prevention of Crime and Criminal Justice 19. A separate report on the preparations for the Eleventh Congress on Crime Prevention and Criminal Justice (A/57/___), which summarizes the substantive and organizational aspects of the preparations for the Congress, is before the Assembly. VII. Other programme activities A. Implementation of crime prevention and criminal justice standards and norms 20. The Vienna Declaration on Crime and Justice: Meeting the Challenges of the Twenty-first Century underlined the important role of United Nations standards and norms in crime prevention and criminal justice. The plan of action for the implementation and follow-up of the Declaration recommended, inter alia, the publishing by States of the Compendium of United Nations Standards and Norms in Crime Prevention and Criminal Justice in the languages of their countries and the updating of the Compendium. 21. The Centre for International Crime Prevention continued its efforts in this field to implement its mandates within the limitations of the resources available, bearing in mind the recommendations of the Committee for Programme and Coordination for a more balanced approach (see A/56/16). The promotion and dissemination of United Nations crime prevention and criminal justice standards and norms was also pursued through advisory services. The standards and norms formed the basis of the work of the Centre in the area of criminal justice reform on most issues, 5