Question 19
19. Which of the following is not a key strategy followed by the clean room approach to software development ?
Answer : (2) Dynamic verification| Previous | Next |
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The basic principles of the clean room process are
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Software development based on formal methods:
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Incremental implementation under statistical quality control
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Statistically sound testing
Reference :principles of the clean room processSoftware tool support based on some mathematical formalism includes model checking, process algebras, and Petri nets. The Box Structure Method might be one such means of specifying and designing a software product. Verification that the design correctly implements the specification is performed through team review, often with software tool support.
Cleanroom development uses an iterative approach, in which the product is developed in increments that gradually increase the implemented functionality. The quality of each increment is measured against pre-established standards to verify that the development process is proceeding acceptably. A failure to meet quality standards results in the cessation of testing for the current increment, and a return to the design phase.
Software testing in the cleanroom process is carried out as a statistical experiment. Based on the formal specification, a representative subset of software input/output trajectories is selected and tested. This sample is then statistically analyzed to produce an estimate of the reliability of the software, and a level of confidence in that estimate.