defect-taxonomy-istqb

Catalogs the three load-bearing defect taxonomies:

1. IEEE 1044-2009 - the formal anomaly-classification standard (canonical for regulated / safety-critical industries).
2. ISTQB CTAL-TA root-cause - the test analyst taxonomy used for retrospective root-cause analysis.
3. Orthogonal Defect Classification (ODC) - IBM Research's eight-attribute framework for in-process defect classification.

Consumers: bug-report-from-failure populates classification fields; defect-report review rejects unclassified defects.

When to use