A14. Cumulative Baseline Tracking Record Drift metrics comparing each candidate model version against both the immediately preceding version and the originally assessed baseline. Prevents incremental changes from cumulatively producing a substantial modification. Automated drift metrics (PSI, statistical tests) are computed at each candidate version evaluation. Sustained drift crossing defined thresholds triggers mandatory review. Responsible party: CI/CD pipeline computes drift metrics. AI System Assessor maintains the baseline and reviews trigger events. Regulations addressed: Article 3(23) (substantial modification); Articles 43–47 (conformity assessment). Key outputs

• Per-candidate dual-axis drift comparison (vs baseline, vs predecessor)
• Cumulative trigger assessment