An architecture was developed from a synthesis of concepts derived from the literature and field observations to identify and integrate the total decision support (DSS) function in organizations. Four distinct types of decision support systems were identified (corporate planning systems; functional decision support systems; executive information systems; and local decision support systems) and were integrated within a framework that incorporated organizational level, system formality, and decision making mode. The architecture is used as a cohesive framework for discussing research and management issues for organization-wide DSS.