In the past four years, several researchers have reviewed the use of computer models in water resources and emphasized the need for DSSs to make these models more useful. Loucks [1992] reviewed the use of models in water resources systems planning, discussing challenges and presenting criteria for evaluating success. He pointed to rapidly developing computer technology as a means of substantially improving the usefulness of models, but he stressed the need for better communication between analysts and decision makers in doing so. Decision makers must articulate well their information needs, and modelers must communicate effectively their results. Goulter [1992] reviewed systems analysis techniques for water-distribution network design and concluded that, in spite of considerable development in the literature, the techniques have not been accepted in practice. He emphasized the need for DSSs which incorporate simulation and optimization models with interactive graphics capabilities to encourage the acceptance of these techniques in practice. This communication is increasingly possible now that interactive, user-friendly computer systems have become the rule, rather than the exception. These DSSs could also assist the designer in the evaluation of reliability and the generation of alternatives. Similarly, Simonovic [1992] reviewed systems analysis techniques for reservoir management and stated that a significant gap still exists between theory and practice. He proposed the integration of new technologies (such as expert systems) with existing simulation and optimization models as a means of closing that gap. Orlob [1992] reviewed the historical development of water quality models and highlighted computer capabilities now available to decision makers. He discussed three of the main elements of a DSS---an information manager, a set of analytical tools, and a user-interface---and concluded that these tools will allow water quality models to become much more useful to environmental managers.