Abstract
This is a study of 89 community-based nonprofit organizations in northern California that provide prevention and care services to persons at risk of or infected by HIV. Executive directors responded to a telephone and mail survey concerning community HIV consortia mandated by the Title II provisions of the Ryan White CARE Act Mandated coalitions are hypothesized to increase the power of the mandating agency over the member organizations; increase interorganizational awareness, interdependence, domain consensus, and cooperation; provide benefits for consortium members; address gaps in community services; influence the division of labor; encourage interorganizational standardization; and stabilize resource exchanges. Although the hypotheses regarding power and stability are not supported, HIV consortia appear to increase organizational interdependence and service-system efficiency. Implications of these findings for theory, research, and policy development are discussed.