Defect Classification and Defect Types Revisited Stefan Wagner - PowerPoint PPT Presentation

Technische Universität München Defect Classification and Defect Types Revisited Stefan Wagner Technische Universität München, Germany Dr. Stefan Wagner Fakultät für Informatik Lehrstuhl für Software & Systems Engineering DEFECTS ‘08, 20.07.2008

Technische Universität München The Real Defect-Detection Process Defect-Detection Description Priority Defect Defect Database Status Number of open Analysis /closed defects

Technische Universität München The Ideal Defect-Detection Process Defect-Detection Severity Effort Trigger Defect Defect Database Type Mode QA Optimisation Empirical Analysis Defect Distributions Quality Model

Technische Universität München State of the Art • Defect Taxonomies – Implementation solution – Beizer • Root Cause Analysis – Analysis of developer mistakes – Fault prevention – IBM • Defect Classification – Classification along several dimensions – IEEE Std 1044-1993 – IBM‘s ODC – HP‘s Defect Origins, Types, and Modes

Technische Universität München Challenges • Different Artefacts – Similar classifications? – Propagation? • Dimensions – Basic set? – What can be reasonably expected to be documented? • Defect Type Distributions – General distributions? – What factors do they depend on? – Domain-specific distributions? • Connection to Quality Models – What quality attributes are affected? – Classifications as part of a quality model or vice versa? • How can we justify the effort for the quality engineer?

Technische Universität München Conclusions • Useful quality assurance optimisation only possible using defect classifications intensively • We need to – find the important dimensions – for different artefacts – provide empirical data – relate classifications to quality models – better integrate the classification in the QA process – Convince practicioners of the value of defect classification