Defect Origin (j) Phase Requirement Analysis Design Coding Unit Testing

Defect Origin (j)

Phase Requirement Analysis Design Coding

Requirement 40

Analysis 10 20

Design 40 40 40

Coding 60 10 40 80

Unit testing 60 30 30 60

Integration testing 30 10 30 30

Field 5 0 6 7

Defects/phase 245 110 146 177

Product Size = 50K LOC

1 Calculate the defect removal rate for every phase

Phase Defect removal rate (per KLOC)Requirement 0.80Analysis 0.60Design 2.40Coding 3.80Unit testing 4.00Integration testing 2.20Field 0.48

2 Calculate the defect injection rate for every phase

Phase Defect injection rate (per KLOC)Requirement 4.90Analysis 2.20Design 2.92Coding 3.54Unit testing 0.40Integration testing 0.20

Field 0.12

3 Calculate the defect escape rate for every phase

Phase Defect escape rate (per KLOC)Requirement 4.10Analysis 5.70Design 6.22Coding 5.96Unit testing 2.36Integration testing 0.36

4 Which phase is the most effective in removing defects?

Phase Defect Removal Effectiveness %Requirement 16.33Analysis 9.52Design 27.84Coding 38.93Unit testing 59.88Integration testing 82.09

5 Calculate the overall defect removal effectiveness.

96.64

Its clear from the above table that defect removal is most effective the Integration testing phase.

6 Do you think reviews and inspections were effective? Explain.

Yes, the final product that was shipped to the customer lies in the 95%-100% comfort zone. Hence the product was able to meet the 95% bench mark. Hence we can infer that the reviews and inspections where effective.

Defect Origin (j)

Unit testing Integration testing Field Defects Fixed in phase

40

30

120

190

20 200

0 10 110

0 0 6 24

20 10 6 714

Formula used

Formula used

Defects Fixed in phase50K

Defects/phase50K

Formula used

Formula 1 used for front end phases

Formula 2 used for back end phases

Formula used

Total Defects escaped = Ti,i

Total Defects escaped50K Ti,i = ΣNi,j (i = i+1 to K & j = 1 toi)

Defects removed at each step * 100%defects on step entry + defects injected in the step

Defects removed at current phase * 100%defects removed on current step + subsequest step

( 1 - Defects removed at current phase * 100% ) * 100 defects removed on current step + subsequest step

Yes, the final product that was shipped to the customer lies in the 95%-100% comfort zone. Hence the product was able to meet the 95% bench mark. Hence we can infer that the reviews and inspections where effective.