Functionality of a Military Scenario Development Environment (MSDE) is traditionally implemented in a proprietary fashion. Virtually every simulation system in existence today utilizes a specific exercise file format that is unique to that system. Each time a new simulation system has been developed, scenarios have been created in proprietary formats to support exercises in that simulation. All too often, these exercises are re-created by re-keying data out of other existing simulation exercise files or training packages. Such redevelopment of exercises is time consuming and costly. Frequently, simulations share similar architectures, and even training objectives. Each utilizes data and data structures that model real world weapon systems, organizations, time, and environment. A great number of standards are available that support modeling of complex systems. Relational database standards define rules of referential integrity for data. Extensible Markup Language (XML) provides for data type definitions in portable ASCII format. Microsoft Office provides standard desktop interfaces typically used by customers and users of military simulations for planning and after action review (AAR). Other standards exist or are developing that support integration of simulation with native C4I systems. This paper describes how a common MSDE software capability could provide for interoperability of simulations across disparate platforms in a fashion that integrates the desktop applications and C4I systems already in common use by the simulation end user.