Watts Humphrey A tribute to the Father of Software Quality Biography
Watts Humphrey A tribute to the Father of Software Quality Biography
Watts Humphrey A tribute to the Father of Software Quality Biography
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12/3/2010<br />
The <strong>Quality</strong> Attitude<br />
Testing Footprint<br />
<strong>Humphrey</strong>, W., “The <strong>Quality</strong> Attitude”, news@sei, Number 3, 2004<br />
Slide 15<br />
Defect Injection Rate Study<br />
• An analysis <strong>of</strong> data from over 8,000 programs written by 810<br />
experienced s<strong>of</strong>tware engineers found that:<br />
Group<br />
Avg. no. defects injected per (KLOC)<br />
All 120.8 (~ 1 defect per 8 LOC)<br />
Upper Quartile 61.9<br />
Upper 10% 28.9<br />
Upper 1% 11.2<br />
• Usually about 95% <strong>of</strong> <strong>the</strong>se defects are found prior <strong>to</strong> release.<br />
• S<strong>of</strong>tware is released with some known defects and a significant<br />
number <strong>of</strong> unknown defects.<br />
<strong>Humphrey</strong>, W., “The <strong>Quality</strong> Attitude”, news@sei, Number 3, 2004<br />
Slide 16<br />
8
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