This is the twelfth in a series of reports from the U. S. Metric Study, conducted by the National Bureau of Standards, focusing on the inputs from nationally representative groups on the costs and problems of the conversion to the metric system. Only 15 of the over 230 groups opposed the change, although many did feel they would be unaffected by conversion to the metric system. The document summarizes the inputs in seven categories: labor; consumer affairs; education; construction; engineering-related industry; consumer-related industry; and natural resources, transportation, health, small business and others. General and specific guidelines were provided so that inputs would be usable and meaningful. For related documents, see SE 014 409, 014 410, 014 411, and 012 591. (JM)