Adherence to medical protocol (quality) is low in most developing countries. We show that, although the differences in knowledge of protocol among doctors in Arusha region of Tanzania are explained by years of training, the differences in actual adherence to protocol and the gap between knowledge and actual adherence are best understood by examining the types of organizations in which these doctors work. These results suggest that some organizations are better at getting doctors to perform at capacity and that understanding the link between organizational structure and protocol adherence is important in any attempt to increase the quality of care. (Contains 3 tables, 1 figure and 6 footnotes.)