Most criticisms of the summative/experimental model of program evaluation, like those of the "technocratic" model of public policy making, assume that the deficiencies of these models can be corrected by adopting a more "pluralistic" view of the policy process (Elmore, 1976, 1978; Lindblom, 1965; Monnier, 1992; Pressman & Wildavsky, 1979). Though partially accepting the validity of this point of view, the author considers the pluralist perspective not in itself sufficient to correct the deficiencies of the summative and technocratic models. Instead, he proposes a "public policy communities" view of the policy process. This approach is illustrated by examining the emergence of a new health care policy in Quebec, the extended care needs classification system [Classification par types en milieu de soins prolongés (CTMSP)].