A/RES/59/250 63. Emphasizes the need for the range and level of skills and expertise assembled by the United Nations system at the country level to be commensurate with that needed to deliver on the priorities specified in each country’s United Nations Development Assistance Framework, in line with the national development strategies and plans, including poverty reduction strategy papers, where they exist, and to correspond to the technical backstopping and capacity-building needs and requirements of the developing countries; 64. Stresses the principle that no core function of the Secretariat can be outsourced to operational bodies, in particular at the field level, without proper financial compensation; 65. Invites the governing bodies of the organizations of the United Nations development system to consider means to strengthen their country-level capacities, including through complementary measures at their headquarters; VII Evaluation of operational activities for development 66. Requests the Secretary-General to continue to assess the effectiveness of the operational activities for development of the United Nations system, including, in particular, by assessing the effective use of all capacities available to provide a comprehensive and flexible response to the demand of developing countries for development support, and to report on the results of this assessment in the context of the next triennial policy review at its sixty-second session; 67. Reaffirms that the effectiveness of operational activities should be assessed by their impact on the poverty eradication efforts, economic growth and sustainable development of recipient countries; 68. Underlines the fact that future assessments of the effectiveness of the operational activities for development of the United Nations system should make full use of the data and expertise available within the system and from national authorities in full collaboration with national stakeholders and United Nations entities; 69. Recognizes the need to optimize the linking of evaluation to performance in the achievement of development goals, and encourages the United Nations development system to strengthen its evaluation activities, with particular focus on development results, including through the effective use of the results matrix of the United Nations Development Assistance Framework, the systematic use of monitoring and evaluation approaches at the system-wide level and the promotion of collaborative approaches to the evaluation, including joint evaluations, and further encourages the United Nations Evaluation Group, under the aegis of the United Nations System Chief Executives Board for Coordination, to make further progress in system-wide collaboration on evaluation, in particular harmonization and simplification of methodologies, norms, standards and cycles of evaluation; 70. Strongly encourages country-level evaluations of the Framework at the end of the programming cycle, based on the results matrix of the Framework, with full participation and leadership of the recipient Government; 71. Recognizes that national Governments have primary responsibility for coordinating external assistance, including that from the United Nations system, and evaluating the impact of its contribution to national priorities; 11