We are developing the Multimedia Integrated Modeling System (MIMS) software suite to address the EPA's current and future interdisciplinary modeling needs. The MIMS software will allow modelers, including model developers and risk assessors, to conduct complex studies with less effort and greater confidence that the results represent the modelers' intent. MIMS will not make scientific or management decisions for modeling studies, but MIMS should allow modelers to better focus their attention on those issues. The MIMS software suite will support the following activities: Data management and manipulation; Model coupling and swapping; Repetitive work, such as modeling multiple locations and conducting sensitivity and uncertainty studies; Computation management, such as managing model executions on remote computers; and Model evaluation. The software suite will support these activities by automating common actions, simplifying manual operations, checking consistency based on information provided by modelers, and providing tools for various activities.