New in v3.0: Step 0 is no longer a single paragraph. It is split into three lenses (Customer / External / Internal) so the team understands why this problem matters now from all sides before touching a tool. Kalyan's #1 critique of weak A3s: "team skipped Step 0 and jumped to Step 1."
"We have had several regulatory NC findings this year. Need to fix them."
Source: Typical shop-floor A3 — background reduced to one vague line.
1. Customer (External): [e.g., JPJ type-approval audit Q2-2026, ASEAN export customer — 2 letters received, model launch at risk]
2. External (Regulation / Standard): [e.g., UN R48 / MS 1234 — headlamp leveling device marking missing on export Hilux batch; auditor cited 14 units across 3 lots]
3. Internal (Plant operation): [e.g., Final Inspection line, station 7 (PI walk); QMS doc-control gate did not cross-reference regulator update to WI revision]
Why now: [e.g., Q2 internal audit finding #ASSB-2026-Q2-014 + customer escalation letter dated 14-Apr-2026 → shipment hold risk on Hilux 4×4 export → ¥X million exposure]
In-scope: "Regulation NCs" (vague).
IN SCOPE: [e.g., All Hilux & Fortuner export models, headlamp & signal-lighting markings, all shifts, last 6 months NCs]
OUT OF SCOPE: [e.g., Other themes, non-regulatory NCs, supplier-side design changes outside ASSB control]
Current: "We have NCs." / Ideal: "No NCs." / Gap: "Many."
5W1H often filled with "—" or one-liner.
Current: [e.g., 14 NC findings / month over last 6 months; 8 different stations; 3 different clauses cited]
Ideal: [e.g., 0 regulatory NC findings per audit cycle (parent-plant benchmark: 1.2/month)]
Gap = 14 − 0 = 14 NC/month
5W1H:
POO box often left empty or "Final Inspection" written without evidence.
Pareto (top 3 stations = 82% of NCs):
| Rank | Station | NC count (6 mo) | % share |
|---|---|---|---|
| 1 | Station 7 — Final PI | 34 | 40% |
| 2 | Station 5 — Sub-assy lighting | 22 | 26% |
| 3 | Station 3 — Trim & final finish | 14 | 16% |
| 4–5 | Other stations | 14 | 18% |
🎯 POO (Point Of Occurrence): [e.g., Station 5 — Sub-assy lighting, gemba walk 22-May-2026, led by HOD Quality + Assembly Section Head]
⚠ TBP hygiene check: POO ≠ station where NC was caught; POO = station where NC first appears. gemba evidence dated, names on it.
"Reduce NCs." — no number, no date, no justification of why it's not fantasy.
BIG-TARGET: [e.g., Reduce regulatory NC from 14/month to ≤ 2/month by 30-Sep-2026 (3 months from baseline close)]
Sub-targets (decomposed by lever):
Why challenging (not BAU, not fantasy): [e.g., 18-month absence of POO analysis; lighting WI has 4-station defect flow; key gauge has no MSA; supplier on 8-week lead time for new sub-assy; requires QMS gate redesign — not a low-hanging-fruit target]
5-Whys stops at Q2–Q3 and blames operator:
Why 1: NC slipped through → Why 2: inspector missed it → Why 3: operator careless. Done.
No alternatives ruled out. TBP-hygiene fail.
Why 1: Headlamp leveling device marking missing on Hilux export units
Why 2: Inspector at Station 7 PI walk did not flag the missing marking
Why 3: PI checklist does not include the UN R48 §6.2.6.1.2 sub-clause check
Why 4: WI revision v3.2 (Mar 2026) was issued without cross-reference to the regulator update of Dec 2025
Why 5: QMS document-control gate (QP-007) does not force a reg-diff cross-reference when WIs are revised
ROOT CAUSE: QMS gate does not link WI changes to external regulation diffs → process/system cause, not operator cause.
Alternatives RULED OUT (TBP requires this):
| # | Countermeasure | Effect | Cost | Speed | Recur | Total | Decision |
|---|---|---|---|---|---|---|---|
| CM1 | Add UN R48 §6.2.6.1.2 sub-clause check to PI checklist (Station 7) | H | L | 2 wk | L | 8 | ✅ ADOPT |
| CM2 | Update QP-007 QMS gate to require reg-diff cross-reference on every WI revision | H | M | 6 wk | L | 7 | ✅ ADOPT |
| CM3 | Re-certify all Final-Line inspectors to UN R48 §6 (2-day training + assessment) | H | M | 4 wk | L | 7 | ✅ ADOPT |
| CM4 | Source new lighting sub-assy with built-in marking plate (supplier design change) | H | H | 12 wk | L | 5 | 🟡 PARK |
| CM5 | Add 100% manual marking station post-PI (rework loop) | M | M | 2 wk | H | 3 | ❌ REJECT (recurrence H — does not fix root cause) |
5W2H for adopted CMs (CM1, CM2, CM3):
| CM | WHAT | WHO (owner) | WHEN (start→end) | WHERE | WHY (link to root cause) | HOW | HOW MUCH |
|---|---|---|---|---|---|---|---|
| CM1 | Update PI checklist v4.0 | [QA Section Head] | [15-Jul → 31-Jul-2026] | Station 7 | Catches missing marking at POO downstream | Checklist rev + sign-off + 1st-piece check | [RM 0 — internal] |
| CM2 | Revise QP-007 QMS gate | [HOD Quality + Doc Contrl Mgr] | [01-Jul → 15-Aug-2026] | Doc Contrl | Addresses ROOT (reg-diff link) | Gate redesign + pilot on 3 WIs + roll-out | [RM 5k consulting] |
| CM3 | Re-certify 18 inspectors | [Training Section Head] | [01-Aug → 31-Aug-2026] | Training room | Capability uplift = human-side defense | 2-day class + written + practical test | [RM 18k — internal cost] |
| CM | Owner | Start | End | Q-by (review checkpoint) | Status | % complete |
|---|---|---|---|---|---|---|
| CM1 — PI checklist v4.0 | [QA Section Head] | 15-Jul | 31-Jul | 07-Aug | [On-track / At-risk / Done] | [%] |
| CM2 — QP-007 gate | [HOD Quality + Doc Contrl] | 01-Jul | 15-Aug | 22-Aug | [...] | [%] |
| CM3 — Inspector cert | [Training Section Head] | 01-Aug | 31-Aug | 07-Sep | [...] | [%] |
"Monitor and review monthly." — no metric, no owner, no 3-perspective split.
👤 CUSTOMER perspective (Voice of regulator / external customer): [e.g., 0 new findings on Jul/Aug/Sep QMS audit; ASEAN customer letter of closure received]
🏢 TOYOTA perspective (QMS, parent plant, brand): [e.g., Zero recurrence for 90 days post-CM3; QP-007 gate live across all WI revisions; parent plant benchmark matched (≤1.2 NC/mo)]
🧑 YOUR OWN perspective (Team learning, capability): [e.g., 5-Whys depth proven at Q5 by team independently on next A3; gemba frequency up from 1×/mo to 2×/mo; 2 inspectors passed certifying-exam with distinction]
⚠ Contingency Plan (if CMs miss target): [e.g., If NC still >4/month by 15-Sep → escalate to Plant Director, trigger CM4 (supplier design change) early, second-line CM = in-line auto-vision check at Station 5]
Yokoten = "share with sister plant" (slogan, no date, no mechanism).
New / Updated Standards:
Yokoten (horizontal deployment — share BOTH success and failure modes):
Next Kaizen — climb the PDCA ladder:
New in v3.0: Reflection is no longer a single line. It is a structured self-evaluation in 4 parts — what worked, what surprised, what I would do differently, patterns to fix. This is the only tab a Plant Director reads twice.
1. What worked (keep doing):
2. What surprised me:
3. What I would do differently next time:
4. Patterns to fix (3× = bias to MEMORY):
From Case Study #2 (Kalyan TMA-SG, 2026): An A3 is "ok" if it fills the template. It is defensible if it passes R1–R5. Apply before submitting to Plant Director.