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An inflator simulation computer program, ISP, has been developed to facilitate the assessment of transient heat transfer models. In addition to providing for incorporation of new transient heat transfer models, this program has several other useful and unique features: 1) it allows gas to have multiple chemical components, 2) it allows gas to use temperature-dependent thermodynamic properties, 3) it can self-generate gas thermodynamic properties through linkage to a chemical kinetic package CHEMKIN, and 4) it allows the users to use either cubic spline or polynomial curve fitting to smooth the noise tank test data. This program can simulate three basic tasks: inflator tank test analysis using either the average temperature method or the dual pressure method, tank test simulation, and bag deployment analysis.