This article discusses the evaluation of primary health care policies based on a case study of the Family Health Program in Florianópolis, Santa Catarina, Brazil. The results are presented in two stages. First, the Program is placed in the context of the Municipality's policies, identifying perceptions of the Program at the administrative level. Second, the author studied the Program's practices based on a sample of five family health care teams using an evaluative framework including variables on accessibility and comprehensiveness. The Program began relatively late in the State capital, but developed a unique model. There is a greater supply of services available to the population not covered by private health plans, although there is a major diversity of practices. The degree of implementation is moderately adequate: the care provided is more comprehensive, but there are problems with access (in the ratio between staff and number of families covered). It is suggested that such proposals for reorienting health care models tend towards rationalization, political legitimization, or democratization of services. The accessibility policy can set the predominant direction.