Good questions, Pinkpetall. We use the audit tool for each of our production processes, which have been identified on our master process flow, and key support processes - Purchasing, Maintenance and System Administration. Document and data control is audited as part of each process - if I audit the lab, for example, I will ensure that they have access to procedures, the procedures and forms are current, there are no uncontrolled documents in use that could impact the system, etc.
Once per year, when I audit System Administration, I will look at the document control process itself - do I have a documented procedure that complies with the standard, does the overall process appear to be effective, etc. When I do that, there is no "product" to trace, tho I suppose I could track several documents and ensure that they are properly controlled, updated, approved, revisions have been communicated, and the like. I don't though since I've done that a piece at a time when I look at each production process.
As far as supplier selection, that is part of the Purchasing Process, and audited then. For Purchasing, its product is the primary output of the process, which would be a completed purchase order and received product. For completed purchase orders the criteria would be appropriate approvals obtained, appropriate vendor selected (approved vendor for critical product, all vendor paperwork on hand), sufficient detail included on PO (specs, timeframe, if calibration - the calibration standard info is there). For received product I would make sure that all the steps for receipt and inspection were completed, inspection sheets in order, material received on time, and any discrepancies resolved. In our case, Purchase does have equipment subject to calibration - the tools used to inspect certain incoming material.
In summary, the product for any process is it's primary output - a controlled document, a completed purchase order, a received product, a training record - and it's criteria are whatever your process deemed critical. If a section of the form does not apply, like equipment calibration, you can simply note that it's not applicable.
Hope that helps! If you need more clarification, just ask
