23 60. This means that, for the situation to be in conformity with the treaty, states party must: a. adopt the necessary legal, financial and operational means of ensuring steady progress towards achieving the goals laid down by the Charter; b. maintain meaningful statistics on needs, resources and results; c. undertake regular reviews of the impact of the strategies adopted; d. establish a timetable and not defer indefinitely the deadline for achieving the objectives of each stage; e. pay close attention to the impact of the policies adopted on each of the categories of persons concerned, particularly the most vulnerable. 61. In connection with means of ensuring steady progress towards achieving the goals laid down by the Charter, the Committee wishes to emphasise that implementation of the Charter requires state parties not merely to take legal action but also to make available the resources and introduce the operational procedures necessary to give full effect to the rights specified therein (Autisme Europe v. France, Complaint No. 13/2002, decision on the merits of 4 November 2003, §53). 62. When one of the rights in question is exceptionally complex and particularly expensive to implement, states party must take steps to achieve the objectives of the Charter within a reasonable time, with measurable progress and making maximum use of available resources (Autisme Europe v. France, Complaint No. 13/2002, decision on the merits of 4 November 2003, §53). 63. The requirement to maintain statistics is particularly important in the case of the right to housing because of the range of policy responses involved, the interaction between them and the unwanted side-effects that may occur as a result of this complexity. However statistics are only useful if resources made available and results achieved or progress made can be compared with identified needs. 64. The Committee refers in this context to the Guidelines on Access to Housing for Vulnerable Groups, of which the Committee of Ministers took note at the Deputies' 995th meeting on 16 May 2007. According to paragraph 11 of the Guidelines: "Housing policies should be evidence based, and therefore the knowledge base should be improved through research and regular data collection. Adequate knowledge of housing situation, especially statistical information, is a prerequisite for effective housing policy design and implementation. Regular collection of relevant statistical information on housing issues, including housing needs assessment should be carried out." 65. The Committee notes that in several areas the Government fails to supply relevant statistical information or does not compare identified needs with the resources made available and results achieved. Regular checks do