I am now have to teach our supplier in quality control, especialy in document control. Because our suppliers are low-tech companies, do you have any simple system to follow?
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It's a little hard to say without knowing more about your situation, but, for some small shops, the purchase order can provide the mechanism. Almost everybody knows enough commercial code to understand what a PO means. So, let's say you want to make sure a machine shop works only to a controlled print. On the PO, put the statement that this part is "per revision 3" for example and include a copy of Rev 3 with the order. Further require that the shipped parts must include that print back in order to be received. In other words, you end up controlling the document for the vendor. You can make up other procedures as you think of them, all keyed to the PO.
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"Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it." Elwood P. Dowd