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PART TWO Managing Software Projects

Metrics. PART TWO Managing Software Projects. Chapter 4 Metrics. Measure 1 Measure 2 …… …… …… Measure n. indicators. PART TWO – Managing - Metrics.  Size-Oriented Metrics. The normalization value: lines of code ( LOC ).  Errors per KLOC.  Errors per person-month.

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PART TWO Managing Software Projects

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  1. Metrics PART TWOManaging Software Projects Chapter 4 Metrics Measure 1 Measure 2 …… …… …… Measure n indicators

  2. PART TWO – Managing - Metrics  Size-Oriented Metrics The normalization value: lines of code (LOC) Errors per KLOC Errors per person-month Defects per KLOC LOC per person-month $ per LOC $ per Page of documentation Page of documentation per KLOC  Programming language dependent Penalize well-designed but shorter programs

  3. PART TWO – Managing - Metrics weighting factor count simple avg. complex measurement parameter number of user inputs X 3 4 6 = number of user outputs X 4 5 7 = number of user inquiries X 3 4 6 = number of files X 7 10 15 = number of ext.interfaces X 5 7 10 = count-total LOC/FP Table on p.94  Function-Oriented Metrics The normalization value: function point (FP) Complexity adjustment values p.91

  4. PART TWO – Managing - Metrics Product Revision Product Transition Product Operation Correctness Robustness Efficiency Integrity Usability Risk  Metrics for Software Quality McCall & Cavano (1978) Understandability Maintainability Flexibility Testability Portability Reusability Interoperability

  5. PART TWO – Managing - Metrics  Correctness: defects / KLOC  Maintainability: Mean-Time-To-Change (MTTC)  Integrity: Threat – the probability that an attack of a specific type will occur within a given time; Security– the probability that the attack of a specific type will be repelled.  Usability: user-friendliness (Ch.15)  Defect Removal Efficiency (DRE) := E / (E+D) Errors found before delivery Errors found after delivery

  6. PART TWO – Managing - Metrics Unstable data Mean value Unstable projects  Statistical Process Control: -- Control Chart [Walter Shewart 1920s] 1. Moving Range Control Chart 2. Individual Control Chart Stable

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