In all cases it was observed that an increase in reliabilityWe report experiments conducted to investigate the correlation between code coverage and software reliability. Block-, decision-, and all-use-coverage measures were used. Reliability was estimated to be the probability of no failure over the given input domain defined by an operational profile. Four of the five programs were selected from a set of Unix utilities. These utilities range in size from 121 to 8857 lines of code. Artificial faults is accompanied by an increase in at least one code coverage measure. It was also observed that a decrease in reliability is accompanied by a decrease in at least one code coverage measure. Statistical correlations between coverage and reliability were found to vary between -0.1 and 0.91 for the shortest two of the five programs considered; for the remaining three programs the correlations varied from 0.89 to 0.99.were seeded manually using a fault seeding algorithm discussed elsewhere. Test data was generated randomly One program was from a suite Of Outer 'pace tained from the faults discovered during the integration
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