Use and effectiveness of mobile units in family planning programs of several foreign countries are surveyed in this demographic report. Services and education provided by mobile unit programs in Tunisia, the United Arab Republic, Honduras, South Korea, Turkey, and Pakistan are examined. Assessed are the various roles mobile units play, their functions, geographic coverage, continuity of care, types of vehicles, methods of operation, personnel, costs, and program strengths and weaknesses. Comparisons among programs in different countries are made where possible. Systematic analysis of cost-effectiveness of the programs is provided in statistical and narrative form. Several tables indicate team performance for the various countries and include raw data for individual teams as well as median figures for all units within the country. Information was obtained primarily from questionnaires distributed by the Population Council in November, 1967. (BL)