What is a Supplier Corrective Action Report (SCAR)?

A 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, and provide evidence of effectiveness — typically using the 8D methodology.

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.

Can you give a corrective action example?

Real corrective action example — PCB solder crack issue: (1) Containment: 100% visual inspection of all 1,200 units in warehouse, quarantined Lot#A382. (2) Root Cause (5-Why): thermocouple drift caused reflow temperature excursion. (3) Permanent Corrective Action: replaced thermocouple, changed calibration interval from 12 months to 6 months, added SPC monitoring. (4) Verification: 0 defects in 500-unit pilot run, Cpk improved from 0.8 to 1.67. (5) Prevention: updated PFMEA, horizontal deployment to 3 other reflow ovens.

供应商纠正措施报告 (SCAR) — SQE 团队完整指南

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什么是 SCAR？ SCAR (Supplier Corrective Action Report) 是客户向供应商发出的正式文件，要求供应商调查根因、实施纠错并提供有效证据。大多数 OEM 要求供应商以 8D 格式回复。 SCAR vs 8D SCAR = 发送给供应商的请求文件 8D = 供应商回复的响应文件二者互补：你发 SCAR，供应商回 8D。何时发出 SCAR 重复缺陷（同一零件、同一缺陷 ≥2 次）安全/法规不合格供应商缺陷导致客户停线显著的 PPM 异常飙升供应商未满足 PPAP 要求时间线要求阶段时限交付确认 24h 接收确认 D1-D3 24-48h 团队/问题描述/围堵 D4 5-10 工作日 5-Why 根因 D5-D6 15-30 工作日纠错实施 D7-D8 30-60 工作日预防/关闭常见错误问题描述模糊 — 需具体到批次、测量值 "操作工已培训"当作 D6 — 非永久措施无验证数据 — "已实施"不等于"已验证" 供应商装死 — 逾期无回复

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