This paper describes experiences with modeling the liquid hydrogen subsystem of the space shuttle. The Symbolic Model Verifier tool and the Software Cost Reduction tool set were used to model and specify the behavior of the system. The tools were then used to check for errors in the models. Modeling a problem from several different perspectives offers the chance to uncover discrepancies among different models and to understand the problem space enough to ask important questions about the behavior of the system. Each tool presented different issues in modeling the problem. Both models and a breakdown of the time spent during this study are included as appendices.

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