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Issue No. 02 - March/April (1991 vol. 8)
ISSN: 0740-7459
pp: 34-40
<p>A method for assessing the differential risk of failure among a system's modules is proposed. The procedure has three components: external-risk assessment, module exposure, and module-failure likelihood. External-risk assessment is a consideration of the system's environment, almost independent of the software's details. To estimate module exposure, the model relates individual modules and their potential faults to the external-failure modes and their economic consequences by reverse-engineering the specifications and analyzing each module's expected use. To estimate failure likelihood, the method uses a reliability model. The method constitutes theoretical foundation for the cost-effective development of software that attempts to reduce the risk of failure. Managers can use the failure-risk estimates to better determine how much testing effort can be economically justified.</p>
differential risk; external-risk assessment; module exposure; module-failure likelihood; external-failure modes; economic consequences; reverse-engineering; specifications; reliability model; cost-effective development; failure-risk estimates; testing effort; program testing; system recovery; systems analysis

S. A. Sherer, "A Cost-Effective Approach to Testing," in IEEE Software, vol. 8, no. , pp. 34-40, 1991.
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