Software Quality Measurement

Software Quality Measurement

1. Used to support decision-making

   • Like
     • Determining levels of software quality
     • Managerial questions about effort, cost, and schedule
     • Determining when to stop testing and release a product
     • Determining the efficacy of process improvement efforts

2. Cost

   • Generic models of cost
     • Based on when a defect is found and how much effort it takes to fix the defect relative to finding the defect earlier in the development process
       • Measurement data collected internally may give a better picture of cost

3. Data

   • Mathematical and graphical techniques can be applied
     • Like
       • Descriptive statistics based
         • Pareto analysis, run charts, scatter plots, normal distribution
       • Statistical tests
         • The binomial test, chisquared test
       • Trend analysis
         • Control Charts
       • Prediction
         • Reliability models

4. Measuring defect occurrences and applying statistical methods

   • To understand the types of defects that occur most frequently
   • Used by software process improvement
     • To prevent, reduce, or eliminate the recurrence of defects