An audit is the point at which a supplier relationship moves from documents to verification. Buyers usually request one before a significant first order or when a market requires it; manufacturers who are asked to host one regularly tend to find that preparation is mostly about records rather than appearance.
Manufacturer audits follow different standards and scopes, but most cover the same subject areas. Knowing them in advance turns an audit from an inspection into a structured conversation.
| Area | What is being verified |
|---|---|
| Facility and layout | Separation of raw material, production and finished goods; control of movement between zones |
| Hygiene and sanitation | Cleaning schedules, records of execution, hand-wash and change facilities |
| Pest control | Monitoring programme, evidence of follow-up on findings, perimeter control |
| Personnel and training | Who is qualified for which task, and how that is recorded |
| Process control | Documented parameters, in-process checks and what happens when a check fails |
| Quality control and laboratory | Methods, equipment calibration, sampling plans, handling of out-of-specification results |
| Traceability and recall | Whether a finished batch can be traced to incoming materials within a defined time |
| Storage and warehousing | Temperature and humidity control, stock rotation, separation of quarantined goods |
| Documentation | Whether the quality system exists on paper and is actually used |
| Maintenance and calibration | Schedules, records, and what happens when equipment is out of service |
The most common reason an audit goes badly is not a dirty factory. It is a document that exists but cannot be found, is out of date, or contradicts another document. Useful preparation therefore centres on records.
Before an audit, the documents worth having ready and current are the quality manual or equivalent, cleaning and sanitation records, pest control reports, training records, equipment calibration certificates, batch manufacturing records for recent production, incoming material specifications and certificates, temperature and humidity logs, and the traceability procedure with a worked example.
It also helps to run an internal walk-through with the audit's subject areas in mind, and to prepare a short briefing for the staff who will be asked questions. Auditors frequently learn more from how a production operator describes their own process than from any binder.
Audits increasingly happen in more than one format. An on-site audit allows direct observation of the process and the physical condition of the facility. A remote or virtual audit, conducted over video, depends more heavily on documents and guided walk-throughs, and it requires the manufacturer to plan the camera route in advance so that the relevant areas are actually shown. Many buyers now use a remote audit for initial screening and reserve an on-site visit for the point where volumes justify it.
The distinction between announced and unannounced audits matters for how much an audit proves. An announced audit demonstrates that the facility can meet a standard when prepared; an unannounced audit is a stronger statement about the normal state of operations. Neither is inherently wrong, but a buyer should know which one they are commissioning and describe it honestly in any internal reporting.
An audit report has more value than a pass or fail. Three uses repay the effort.
Attach it to the specification or quality agreement, so the audited scope and date are part of the contractual record. Use findings as an improvement plan with dates rather than as a verdict — most audits produce observations, and a supplier who closes them on a schedule is demonstrating more than one who passed with no findings at all. And set a re-audit interval appropriate to the risk, because a certificate from three years ago describes a facility that has since changed staff, equipment and probably products.
For many buyers a document review is enough for a trial order, with an audit following once volumes grow. Where a market requires verification, the audit's scope is usually defined for you.
It verifies documentation and, with preparation, much of the process. It is weaker on observing physical conditions and unplanned behaviour, which is why many buyers use it for screening.
The audit standard and scope, whether it is announced, the report format, the timeframe, and who on both sides owns the corrective action list.
Arranging a supplier audit? Shandong Guihe Pet Food Co., Ltd. manufactures pet supplements and pet food in Yishui County, Linyi, Shandong, with a 12,000 m² plant and 30,000 tons of annual capacity. See our company profile, our OEM & ODM services, or read about testing and quality control.