Defect Removal Rates
June 15, 2008
As has been stated previously, Agile encompasses more than a methodology or framework. Total Quality Management is also of major importance because higher quality = less rework = higher thoughput into production. The following table highlights the defect removal efficiency rates associated with the most common techniques. For a relatively modest input -e.g. formal code inspection, the output is a much lower defect density. The interesting thing is the fact that Testing is less effective at finding defects than formal activities. Which one is the cheapest to perform?
|
Removal Step |
Lowest Rate |
Modal Rate |
Highest Rate |
|
Informal design reviews |
25% |
35% |
40% |
|
Formal design inspection |
45% |
55% |
65% |
|
Informal code reviews |
20% |
25% |
35% |
|
Formal code inspections |
45% |
60% |
70% |
|
Modeling or prototyping |
35% |
65% |
80% |
|
Personal desk checking of code |
20% |
40% |
60% |
|
Unit Test |
15% |
30% |
50% |
|
New Function (component Test) |
20% |
30% |
35% |
|
Integration Test |
25% |
35% |
40% |
|
Regression Test |
15% |
25% |
30% |
|
System Test |
25% |
40% |
55% |
|
Low-Volume beta Test ( < 10 sites) |
25% |
35% |
40% |
|
High-Volume beta test *> 1000 sites) |
60% |
75% |
85% |
Please refer to Software Estimation - demystifying the black Art by Steve McConnell.
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