This paper has two major purposes. First, it presents argument and evidence related to the suitability of using Policy Delphi in the formulation of national or federal water policy. Much of the associated discussion is organized in terms of a comparison of Delphi purpose and structure with those of other Idea Generating Strategies (IGSs). Second, it presents argument and evidence related to the value of expert opinion, and its role as an integral component of any Policy Delphi application. Associated discussion focuses on the identification and declaration of expert sampling criteria in the context of water and other policy. In addition, a recommendation is presented to consultants, managers, stategists, and others who must regularly synthesize divergent opinion and evidence and bring forth policy statements. The conclusions indicate that a Policy Delphi has no structural elements that would limit its application to water policy development or other environmental management problems that demand definition.