This article reviews modern techniques for controlling parasitic nematodes in sheep and goats. It outlines the foundation for an epidemiological monitoring system as the cornerstone in the control of gastro-intestinal helminthic infestations in small domestic ruminants. One major goal of the work of veterinary parasitologists is to obtain the information needed to design strategies for the control of parasitic infestations in domes tic animals. Thus they are actively involved in solving problems important in terms of public health, or in economic terms, as in the case of parasitic infestations in livestock animals (Morales and Pino, 1987). The central purpose of the present article is to review the latter.