How do you write an effective SCAR?

An effective SCAR clearly describes the nonconformity with objective evidence (photos, measurements, dates), specifies the containment actions required (sort, quarantine, 100% inspection), sets a response deadline, and includes verification criteria. The supplier should respond using 8D format (D1-D8).

What is the difference between SCAR and 8D?

SCAR is the request document sent TO the supplier. 8D is the response document sent BY the supplier. In practice, most OEMs require suppliers to respond to a SCAR using the 8D format, making them complementary components of the supplier quality process.

What should be included in a SCAR response?

A complete SCAR response should include: D1 team members, D2 problem description with 5W2H, D3 containment actions with evidence, D4 root cause analysis (5-Why and fishbone), D5-D6 corrective actions with implementation dates, D7 systemic prevention, and D8 verification evidence.

How long does a supplier have to respond to a SCAR?

Typically, suppliers must acknowledge receipt within 24 hours (D1-D3), provide root cause analysis within 5-10 working days (D4), and complete permanent corrective actions within 30 days (D5-D6). Severe quality issues may require faster response times.

Supplier Corrective Action Report (SCAR) — Complete Guide for SQE Teams

What Is a SCAR?

A Supplier Corrective Action Report (SCAR) is a formal document sent by a customer to a supplier when a nonconformity is detected. It requires the supplier to:

Investigate root causes

Implement corrective actions

Provide evidence of effectiveness

Most OEMs require suppliers to respond using the 8D methodology format.

SCAR vs 8D

**SCAR** = The REQUEST document sent TO the supplier

**8D** = The RESPONSE document sent BY the supplier

They are complementary: you issue a SCAR, the supplier responds with an 8D.

When to Issue a SCAR

Issue a SCAR when:

Recurring defect (same part, same defect, 2+ occurrences)

Safety or regulatory nonconformity

Customer line stoppage caused by supplier defect

Supplier fails to meet PPAP requirements

Significant PPM spike (statistically out of control)

Do NOT issue a SCAR for:

One-time, isolated incident with clear cause and fix

Issues resolved during regular supplier communication

Cosmetic issues below specification threshold

SCAR Response Requirements

A complete SCAR response should include:

1. **D1 — Team**: Cross-functional team members with names and roles

2. **D2 — Problem Description**: 5W2H with objective evidence (photos, data, dates, lot numbers)

3. **D3 — Containment**: Actions taken, quantities, dates, clean point

4. **D4 — Root Cause**: 5-Why and fishbone with TRC, MRC, and escape point

5. **D5-D6 — Corrective Actions**: Permanent fixes with implementation dates and verification data

6. **D7 — Prevention**: System changes, FMEA updates, horizontal deployment

7. **D8 — Verification**: Evidence package (photos, data, capability studies)

Timeline Expectations

Common SCAR Mistakes

1. **Vague problem descriptions** — "Quality issue with Part X" is unacceptable. Be specific: "0.5mm burr on Part X P3 edge, Lot#A938, detected at customer incoming inspection"

2. **Accepting "operator retrained" as D6** — retraining is not a permanent corrective action

3. **No verification data** — "Implemented" without capability study data is not verified

4. **Supplier ghosting** — no response after initial acknowledgment

Key Takeaways

1. SCAR is the request, 8D is the response

2. Be specific in problem descriptions — data beats adjectives

3. Set clear deadlines and escalate promptly when missed

4. Retraining alone is never a valid permanent corrective action

5. When a supplier's 8D blames "operator error", push back — ask what system failed