The Software Quality Profile (Figures)

PSP Phase

Injected/hour

Removed/hour

Removed/Injected

DLD

1.76

0.10

  0.05

DLDR

0.11

2.96

27.91

Code

4.20

0.51

  0.10

CDR

0.11

6.52

59.78

Compile

0.60

9.48

15.84

Test

0.38

2.21

  5.82

Dimension

Meaning

Design/Code Time

The ratio of detailed design to coding time - when engineers do not take the time to produce a thorough design, they generally make more design errors. To reduce this risk, design time should equal at least 100% of coding time.

Code Review Time

The time spent in code review, compared with coding time - by doing a personal code review before they compile, engineering can find a large percentage of their defects. A thorough code review should take 50% or more of coding time.

Compile Defects/KLOC

The defects per KLOC found in compile - even with good review times and rates, the review still could have missed a lot of defects. For quality products, compile defects should be less than 10 defects/KLOC.

Design Review Time

Detailed design review time, related to detailed design time - a thorough detailed design review should take 50% or more of the time spent in detailed design. Anything less generally indicates an inadequate review.

Unit Test Defects/KLOC

The defects per KLOC found in unit test - the number of defects found in unit test is one of the best indicators of the number that will later be found. When the unit test defects/KLOC exceed 5, subsequent problems are likely.