9.2 Hosting the customer audit

A customer audit is a rigorous verification of contract compliance and process capability. The auditor’s goal is to evaluate operational controls; the engineering goal is to confidently demonstrate mature predictability in the factory. Success relies entirely on pre-planned architecture and disciplined execution. It is important to organize the flow of information, the physical environment, and the narrative.

The audit architecture (the structured flow)

A structured, professional setting must be provided for the audit to ensure information is presented accurately and completely.

The Room Dynamic:

The Front Room: This is the primary meeting space. It contains the Auditor, the official Host (Quality Director/Plant Manager), and the currently relevant Subject Matter Expert (SME). It should be organized and focused on the audit.
The Back Room: This is your support hub, located out of sight and staffed by your document control and engineering team.
- The Scribe: Sits in the Front Room (silently) and logs auditor requests into a live internal chat channel.
- The Runner: Sits in the Back Room, retrieves the requested document, reviews it for completeness and accuracy, and then delivers the verified, complete copy to the Front Room.

The Filter Rule:

Whenever a requested document has a missing secondary signature or is otherwise incomplete, the Back Room catches it before it goes to the auditor. When a mandated record is missing, the Back Room prepares the mitigation strategy and the CAPA draft immediately, allowing the Host to be prepared with a proactive response.

The “pre-flight” preparation

A thorough 5S sweep of the areas to be audited must be executed prior to their arrival.

The Readiness Check:

Infrastructure:
- All chemical bottles (e.g. IPA, Flux) on workstations must be verified as properly labeled per safety standards.
- The MRB quarantine cage must be ensured to be locked and under proper access control.
Production Line:
- All unauthorized “cheat sheets” or handwritten notes taped to equipment must be removed. Only revision-controlled Work Instructions (WIs) must be ensured to be in use.
- Personal items must be confirmed to be kept out of designated ESD zones.

Interview discipline (the “answer the question” protocol)

Operators may unintentionally provide ambiguous or out-of-context information during audits. Staff must be trained on a clear, professional communication protocol.

The Logic of Interaction:

The Auditor Ask: “Do you calibrate this electric torque driver?”
The Unhelpful Answer: “Yes, usually every Tuesday, but the tech was sick last week, so we skipped it and did it Wednesday instead.” (This volunteers a potential non-conformance without context).
The Professional Answer: “Yes.” (Wait for the next question).
The Auditor Follow-up: “Show me the calibration sticker.”
The Prepared Action: Safely point to the sticker. Do not elaborate on the history of the sticker unless explicitly asked.

The closing meeting

The closing meeting is an opportunity for professional alignment and clarification.

The Closing Logic:

Should the auditor present a drafted finding based on a technical misunderstanding of your process, clarify it immediately with objective engineering evidence. Resolving it before the final report is issued is highly efficient. When a finding is factually valid, accept it professionally and firmly state your correction timeline (e.g. “Understood. We will submit a formal 8D CAPA within 5 business days”).

Recap: Pre-Audit Preparation and Response Protocols

Parameter	Requirement	Action	Condition
Document Control	Complete, accurate, with all required signatures.	Back Room reviews & holds incomplete docs; prepares CAPA draft for missing records.	Upon auditor request.
Work Instructions	Only revision-controlled WIs in use; no unauthorized notes.	Remove all unauthorized notes from equipment prior to audit.	Pre-flight preparation.
Tool Calibration	Valid calibration sticker present.	Point to sticker; do not elaborate. If unknown, state data will be verified.	During auditor inspection.
MRB Access	Quarantine cage locked; access controlled.	Ensure lock & control are functional prior to audit.	Pre-flight preparation.
Interview Protocol	Answer only the specific question asked.	If answer is unknown, state: “That data will be verified with the lead engineer.”	During auditor questioning.