Section I: History, Theory, and Challenges. Characterizing watershed and landscape management. Challenges of management and modeling. Perspectives in ecological modeling and simulation. Perspectives in hydrologic modeling and simulation * Section II: Choosing Models and Modeling Environments. Questions addressed with single discipline simulation models. Questions addressed with multidiscipline simulation models. Creating new models. Coordinating large-scale, interdisciplinary watershed modeling. Analyzing alternatives. Who develops and runs the models? Error and uncertainty analysis. Model evaluation guidelines * Section III: An Integrated Watershed Modeling and Simulation Future. Approaches to future model integration. Design philosophies. Watershed manager view. Modeler view. Day 2 - Establish Subteams. Programmer view. Conclusions.