The High Level Architecture (HLA) is widely used in defense applications as a common framework for modeling and simulation. The Federation Development and Execution Process (FEDEP) is a generalized process to build HLA federations from scratch. However, simulation model design, implementation, testing and execution defined in the FEDEP are time consuming and expensive. The Model Construction Environment (MCE) is introduced in this paper as a web-based system to enhance the efficiency of the

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... ration development by reusing the existing Simulation Object Models (SOM) to build new Federation Object Models (FOM). To ensure the compatibility of the SOMs in a FOM, a Matching Algorithm is defined and tested. An Extensible Elements scheme is designed to help shape the characteristics of the FOM/SOMs. This study can contribute to more cost-efficient methodologies for the development and execution of simulation models.