A/RES/57/305 45. Recalls paragraph 39 of resolution 57/300 of 20 December 2002, and requests the Secretary-General to ensure that movement from the General Service to the Professional category is consistent with legislative mandates; 46. Notes with concern the low proportion of staff below the age of 35, and requests the Secretary-General to examine the factors that inhibit the selection of young people and to report accordingly to the General Assembly at its fifty-ninth session; Mobility 47. Welcomes the efforts of the Secretary-General to develop a more versatile, multi-skilled, mobile and experienced international civil service; 48. Recalls section V of resolution 55/258; 49. Stresses in this regard that when implementing mobility policies, the SecretaryGeneral should ensure that: a) Mobility does not negatively affect the continuity and the quality of services and the institutional memory and capacity of the Organization; b) It does not lead to the transfer or abolition of posts as a result of vacancies; c) It has a positive impact in filling existing high vacancy rates in some United Nations duty stations and regional commissions; d) There is a clear differentiation between mobility within duty stations and mobility across duty stations and that the latter should be a more important factor in career development; e) Mobility is encouraged in all categories of Professional and higher level posts; 50. Acknowledges that mobility needs to be supported through greater efforts to improve conditions of life and work throughout different duty stations; 51. Encourages the Secretary-General to expedite, as appropriate, the agreements between the Secretariat and the United Nations funds and programmes and the specialized agencies for all staff levels in relation to mobility; 52. Requests the Secretary-General to take the necessary steps to ensure that mobility will not be used as an instrument of coercion against staff; 53. Also requests the Secretary-General to closely monitor mobility and to submit proposals to the General Assembly, for consideration at its fifty-ninth session, in order to solve any problems resulting from increased staff mobility; Performance management and career development 54. Acknowledges with appreciation the achievements to date in establishing and promulgating organizational values and core and managerial competencies, expanded learning and development programmes and a revised performance management system as steps towards developing staff careers; 55. Notes with appreciation the efforts of the Secretary-General to create a fair, equitable, transparent and measurable system of performance management for all staff, and encourages the Secretary-General to continue to develop a results-based culture that rewards excellent performance; 56. Requests the Secretary-General to implement all necessary measures to further enhance a comprehensive and systematic career development system, including in the areas of the performance appraisal system, training and competitive examinations, in order to 6