Measure from “Day 1”; Build Models to “Understand”

NASA Programs Software Product Characteristics

(Cost Distribution)

Defect by Error Class (PCS)

100.0

75.0

50.0

0.0

25.0

% of All Errors

Initialization

Logic/Control

Internal Interface

External Interface

Data

Typo/Format

Engineering Models of Processes

Size of Change Vs. Effort in Maintenance

0

2000

4000

6000

8000

0

5000

10000

15000

20000

Total SLOC Added, Changed, or Deleted in Release

Total ReleaseHours

Enhancement Releases

Mixed Releases

Error Correction Releases

Linear (Enhancement Releases)

Effort = (0.36 * SLOC) + 1040 R**2 = .75

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