CMMI & Continuous Improvement

#!/usr/bin/env python3
# 8D Report template for field escape corrective action

eight_d = {
    "D1_Team":       "SW Test Lead, SW Architect, Safety Engineer, Quality Manager",
    "D2_Problem":    "Field report: ABS intervention mis-timed by 15 ms in specific ESP scenario "
                     "(cornering + threshold braking); customer complaint FR-2026-0042",
    "D3_Containment":"Interim: disable affected ABS blending algorithm in OTA patch v3.2.1; "
                     "deployed to 12,400 vehicles via OTA within 48h of detection",
    "D4_RootCause":  "SWE.3 unit: ABS_Blending_Task had undetected race condition on shared torque "
                     "buffer with ESC task. Race window = 2 μs; triggered at ~1 per 10k ABS events. "
                     "Root cause: missing mutex in shared buffer access introduced in CR-0891.",
    "D5_Actions": [
        "Add RTOS mutex to all shared buffer accesses in ABS_ESC interface",
        "Add race condition static analysis rule to CI pipeline (Polyspace concurrency checker)",
        "Extend unit test to cover concurrent task access patterns (TESSY multitask test)",
        "Update code review checklist: RTOS shared resource access requires mutex evidence",
    ],
    "D6_Implementation": "Actions implemented in v3.3.0; 72h CI regression complete; Safety review signed off",
    "D7_Prevention": [
        "Lesson learned added to SW Development Process Guidelines Section 4.3",
        "RTOS concurrency checklist added to design review template",
        "Polyspace concurrency analysis added to all future ASIL B+ builds",
    ],
    "D8_Closure":    "8D closed 2026-03-01; OTA v3.3.0 deployed; customer confirmed resolution",
}

for step, content in eight_d.items():
    if isinstance(content, list):
        print(f"{step}:")
        for item in content: print(f"  • {item}")
    else:
        print(f"{step}: {content}")
    print()