Per a higher level quality document (i.e., ISO 9001, AS9100, etc.), can the supplier be held accountable if a best practice has been established, but not adhered to in all applicable areas at the manufacturing site?
I talked with the submitter for further clarification.
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The contractor has documented information in the form of “best practices.” Some of these practices flow down from contract requirements and some are the result of experience or “ tribal Knowledge.” The contractor does not consider them as requirements and does not require their implementation. They are not “controlled documents.”
There are no requirements in ISO 9001 for the contractor to create best practices procedures. However, once he has created the document, it should fall under document control procedures and be enforced.
Per the conversation with the submitter the contractor appears to be willing to document these as procedures and put them under document control.