In 1995, the National Social Economy Survey (NSES) collected fitness data through Questionnaire Module NSES. The method is efficient and practical to collect community based data, since it was asked through questionnaire without VO2max measurement and can be done by non-medical workers. In 1998, study of diagnostic test was conducted to validate physical fitness index based on fitness data from the Module Susenas questionnaire of 1995. A sample of two hundred and thirty five respondents at the 20—39 age groups was selected purposively from Kebon Manggis residents, Jakarta. The results showed that reliability index of module Susenas 1995 were good enough. The optimum cut-off score for men at the age of 20—29 is 48/60, with sensitivity 86.4% and specificity 27.8%; the optimum cut-off score for women is 16/18, with sensitivity 62.5% and specificity 44.0%. The optimum cut-off score for men at the age of30—39 is 40/48, with sensitivity 83.0% and specificity 66.7%; for women is 36/48, with sensitivity 78.8% and specificity 57.1%.