软件测试参考文献(3)

The typical approach to functional design veri cation isa combination of one-factor-at-a-time and random/intuitivetesting. The random/intuitive method mainly tests for faultspreviously found in similar products. This is an insuf cientmethod, especially for products with completely new func-tions and thus no previously known failure modes.

RTM’s only disadvantage is that it cannot give a measureof the percentage of fault detection. Producing test traceabilitytables, which list all the functional requirements to be metand the tests covering them, compensates for this disadvan-tage. In our experience, once we have tested a product withRTM, combined with detailed timing veri cations using one-factor-at-a-time tests, we ndno further functional errors at

the higher levels of productintegration or in the eld.

RTM effects on productdevelopment

Figure 1 shows the typicalproduct developmentprocess model. Followingthis model, one developstest speci cations only afterthe design phase is completeand performs tests only afterthe implementation phase.With RTM, the processchanges somewhat, asshown in Figure 2, re ectingthe capability of designingthe RTM-based test set as

54IEEE DESIGN & TEST OF COMPUTERS

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