Most factory visits follow the same script: a meeting room, a walk along a line, a sample on a table. That format tells you very little, because every factory can produce a clean line for an hour. A useful audit looks at records rather than at rooms.
What to see in person
The production line running your product. Not a demonstration line — the actual line, mid-batch, with the work instructions for your model visible at the station.
The test bench and the ageing rack. Ask to see a unit being tested and to watch the readings change as load is applied. If the rack is empty, ask what is being aged today.
The incoming inspection area. This is where a substituted component gets caught. Look for the approved sample board — the physical parts that incoming goods are compared against.
The batch records. Pick a shipment that already went out and ask to see its report: what was measured, the values, the date code. This is the single most revealing item on a visit, because it is either there or it is not.
Packing, in progress. Accessories, manual and carton assembled at the table. This is where retail programmes are won or lost, and where a photograph of the actual packed unit matters more than any artwork proof.
The tool shop or its partner. At least understand whether tooling is in-house or subcontracted, because that is the lead time you cannot compress.
The two questions that matter
Who can stop a shipment? If the answer is “the quality manager”, ask to meet them and ask what they stopped last. A quality function with no authority is a formality.
What changed in this product since the sample? Every real answer here is useful: a component, a supplier, a cable, a finish. A factory that answers “nothing changed” for a product made months after the sample is either very disciplined or not tracking it.
What a remote audit can still do
If travel is not possible, ask for a short video call from the line during your batch: the station, the test bench reading, the packed carton with the label. Ten minutes of live footage is worth more than a photograph library, because it cannot be staged easily.