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SummaryA development model for IndiaA model for the economic development of India in the 1960—1970 period is described from the statistical point of view. The model contains 13 sectors, each with their specific products for which balance‐equations are set up. Input‐output and capital‐output relations connect the sectors. Agricultural output is linked to the use of fertilizer, irrigation and advice. Consumption in 1970 is maximized within 35 constraints. The paper winds up with a discussion of the effects of statistical uncertainties, and of possible improvements of the model.

SummaryEducation and intelligence according to tests of conscripts.All Netherlands conscripts are subjected to five psychological tests. The test results for a sample of approx. 2000 conscripts have been split up according to school education received, and first and second moments were calculated.While different levels of education are accompanied by significantly different average test results, the variance within each group is still very large.Principal component analysis indicated a preponderant "general level" factor and a small "technical bias" factor. No single school type produces boys of modest "general level" but good "technical bias".