This proposal is for the development of a highly extensible and user-configurable software application for end-to-end mission simulation and design. We will leverage the plug-and-play architecture of our existing simulation, visualization and command software, developing new capabilities for data fusion, operations planning, plan validation, and adjustable automation. The core application, VisualCommander, has been developed over the last 4 years under SBIR and IR&D funding as a revolutionary way of providing integrated design and simulation from mission conception through mission operations. The software design of VisualCommander (VC) has been driven by the goals of extensibility, re-use of functionality, and user-configurability. As such, it serves as an ideal foundation upon which to build additional in-depth functions that are valuable for this purpose. VisualCommander is designed to integrate legacy engineering software with user-generated design and simulation tools into a single, user-friendly environment. It automates the flow of data between analysis, design, and simulation applications with minimal user manipulation.