Reported cases of incest in Multnomah County, Oregon, as in the rest of the country, are increasing yearly. Effective networking between agencies is important in order to successfully work with the problem. The research problem of this study was to determine the effectiveness of the present network of agencies working with incest in Multnomah County. In order to evaluate network effectiveness the following objectives were established: to provide a "cultural" description of the major components of the Multnomah County network; to determine whether a common definition of incest among practitioners exists and to compare the networking system in this county with others throughout the country.