Abstract
Flight crew simulator failures are costly and may have an impact on the timing or efficiency of a mission; thus, reliability is one of the most important issues facing simulator developers today. The reliability of a simulator is the probability that a training session of length t can be completed without a failure. This paper defines simulator failure and then identifies and compares the three sources of simulator failure: hardware, software, and human, focusing on the cost of software failure. The paper next describes a model for software reliability measurement and proposes a method for establishing a software reliability objective. Data from the NASA Shuttle Mission Training Facility illustrate the technique. Finally, the paper examines the implications of using the method on the software testing successes.
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