An F-16 Environmental Control System (ECS) computer model was developed to assist engineers with the design and development of ECS control algorithms. This model consists of many dynamic component modules (ducts, valves, heat exchangers, compressor, etc.). The accuracy of this analysis tool was verified by comparing model results to F-16 ECS test-stand and test-aircraft data - the verification results are in excellent agreement. Presented in this paper are modeling techniques, model descriptions, verification results, discussion of test-stand data reduction and comparison, and discussion of the comparison with flight-test data.Our F-16 ECS model is a viable and accurate simulation tool for concurrent analysis and design of environmental control systems. The knowledge and experience that was gained from developing this comprehensive model has provided General Dynamics with the expertise to expeditiously develop a dynamic ECS model for any aircraft and to use that model for control-law development and analyses. The design and analysis techniques that were developed through this effort are tools that can be used for concurrent engineering.