The chart compares projected defect discovery patterns with actual defect discovery patterns for unit testing and integration testing. The actual integration test defects, shown by the plus markers, closely follow the projected integration test defect curve. This indicates that integration testing is finding approximately the number of defects expected over time. The unit test actuals do not provide as strong a match to the projected unit test curve, so concluding that unit testing is isolating exactly as predicted is less supported. The chart also does not prove poor unit test planning or unusually high integration test effectiveness; it simply compares actual results to predictions. Therefore, the supported conclusion is that integration testing is isolating as many defects as predicted.

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