I (we) ditched the supplier survey thing the second day I came on board as the QA Manager. If they have a cert,,,all is good,,,if not,,,all is good,,, providing they meet delivery and quality criteria. We manage by exception and canvas only suppliers that are non-conforming at one time or another. If our customer demands "single source" purchasing and that supplier goes out of business then I lay it back on them to deal with it. There many more issues to worry about, compliance wise, than if they will or will not fill out a document not worth the paper its written on. Just my .02