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Given a test set T to test a program P, there are at least two attributes of T that determine its fault detection effectiveness. One attribute is the size of T measured as the number of test cases in T. Another attribute is the code coverage measured when P is executed on all elements of T. The fault detection effectiveness of T is the ratio of the number of faults guaranteed to result in program failure when P is executed on T to the total number of faults present in P. An empirical study was conducted to determine the relative importance of the size and coverage attributes in affecting the fault detection effectiveness of a randomly selected test set for some program P. Results from this study indicate that as the size of a test set is reduced, while the code coverage is kept constant, there is little or no reduction in the fault detection effectiveness of the new test set so generated. For the study reported, of the two attributes mentioned above, the code coverage attribute of a test set is more important than its size attribute.* This definition assumes that the underlying hardware does not fail during the execution of a block.

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