This yearbook is an effort to reevaluate the metric system and to present testimonies from people in various occupations with respect to metric usage (as of 1948). The first of four major sections explains the metric system and its development. Next are 29 articles discussing the usage of the system in the general areas of education, science, engineering, manufacturing and merchandising, medicine and pharmacy, world trade, armed forces, and athletics. In the public interest section, accounts of magazines, reports, newspapers, radio, and clubs advocating the adoption of the system are given. The fourth section centers on methods of making the adoption both in education and in general. (LS)