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A random sample of 912 persons in Delft, the Netherlands, was used to investigate the influence of several variables on the independent variable of SP progressiveness (SPP). A matrix of correlations between 15 items of the original questionnaire was computed: 8 items which were highly related to each other were found. These items were used as indicators for SSP by summing the answers of each R on every item. On these scores an analysis of variance was carried out with 5 independent variables: religion, age, income, level of educ, & sex. The following findings were obtained: (a) Religion had a signif influence on SPP scores; R's who do not have any specific religion tend to be more progressive than others. Furthermore, Catholics tend to be more progressive than Protestants & Dutch-Reformed. (b) The level of educ & income had signif influences on SPP-scores; the higher the income or the educ'al level, the lower the progressiveness-score. (c) The variables age & sex did not have signif influences on SPP-scores. (d) The 5 variables included in the design explained 32% of the total variance in the SPP-scores. Of the remaining 68%, about 27% can be explained in terms of error-variance. This means that about 41% of the total variance in SPP-scores has to be explained by factors which are not included in the design. 3 Tables. Modified HA.