text: (whether the variable was significant or trivial for development) and validity (whether it measured what it was intended to measure). 65. The Expert Group described three primary purposes of a frame­ work of socio-economic development indicators. First, it must yield acceptably valid, reliable, timely and relevant measures of the trends and current levels or status of well-being, together with estimates of the distribution among the population. 66. Second, such a system must seek to provide policy-makers and their technical advisers with some awareness of the influence of the more significant determinants affecting changes in areas of social con- 5 United Nations publication, Sales No. 74.XVIl.8 . 6 United Nations publication, Sales No. E.78.XVIl.8. 16 • I cern. In particular, those factors that were both influential and subject to policy manipulation should be separately identified and their impact estimated. Third, in order to develop a framework of social indicators that bore some relation to the interactive processes affecting different variables, separate measures had to be capable of linkage so that their mutual effect could be estimated. Such linkages implied, in turn, -the prior establishment of a set of common concepts, operational defini­ tions, procedural rules and classifications according to which data collection and processing were carried out. 67. Meeting the data requirements of a framework of development indicators was a serious problem in ES CAP countries. Of the 100 indi­ cators chosen for a study by UNRISD, 22 countries of Asia and the Pacific had the required data for an average of only 54 indicators. B. DEMOGRAPHIC INDICATORS 68. Since the principal purpose of social indicators was to measure individual well-being, demographic data were central to a framework of indicators. Population was the source and object of development and should be the common denominator for economic and social in­ dicators. 
analysis: The text discusses the development of a framework of socio-economic development indicators, which seems to focus on measuring the well-being of individuals and populations. It highlights the importance of demographic data, the need for valid and reliable measures, and the requirement for data linkage to estimate the mutual effect of different variables. This suggests that the category should be related to human development and social indicators.