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Figure 6.1 illustrates an FI / FIO plot obtained for Fone Follower. Note how the FI / FIO ratio drops very rapidly during early system test. This is typical behavior when you drive test with the operational profile. You invoke the most frequently used operations first and you find and remove any faults that exist in them quickly. Compare this with system test where you invoke all operations with equal probability (the dashed line).

FI/FIO
 
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Figure 6.1 FI / FIO plot for Fone Follower



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