AbstractThe paper examines a number of empirical studies which investigate the implementation problems that have been experienced in Third World countries. Most of these studies are evaluation studies, specifically undertaken in order to identify the type and frequency with which implementation problems were being experienced. Only one of the studies is country‐specific (Indonesia), drawing its data directly from the problem‐reporting component of the national monitoring system, although encompassing a sufficiently large number of projects for some general conclusions to be drawn. The paper finds that about half of the implementation difficulties experienced in Third World projects or programmes arise through the procedures and operating methods of central ministries other than the implementing ministry. The key ministries are principally planning, finance and personnel. Concentration by Third World governments on strengthening the central procedures under which all projects operate, therefore, is likely to have a disproportionately high impact on the implementation of development programmes. Suggestions for obtaining this improvement conclude the pa