DEFECT CLASSIFICATION AND ANALYSIS

DEFECT CLASSIFICATION AND ANALYSIS

1. GENERAL TYPES OF DEFECT ANALYSES

   • What
   • Where
   • When
   • Pre- or post-release
   • How and Why

2. Defect distribution analysis

   • permission denied
   • no such file or directory
   • stale NFS file handle
   • client denied by server configuration
   • file does not exist
   • invalid method in request
   • invalid URL in request connection
   • modmimemagic
   • request failed
   • script not found or unable to start
   • connection reset by peer
   • What: Distributionoverdefecttypes
   • Where: Distribution over defect locations
   • General observations about defect distribution

3. Defect trend analysis and defect dynamics model

   • Most of the defect data contains some timing information. At a minimum, the discovered defect is classified as either pre-release or post-release. This information can be used to give us a general picture of the defect trend. When used with appropriate models, these data can provide us with the basis for prediction into the future.
   • Defect causal analysis

4. DEFECT CLASSIFICATIONAND ODC

   • ODC concepts
     • Key defect attributes from the failure
       • Defect impact
       • Defecttrigger
       • Defect severity
     • Key information
       • Defect type
       • Number of lines changed for the fixing