We received our ISO 9001 registration 6 months ago. We put a sticker that has "For Reference" on it on all 3-ring binders that each person, about 30, has in his/her cubicle to differentiate between controlled documents and reference documents. All controlled documents are indicated on Master Document Lists at this time, by element. The third-party auditor never makes a comment about these stickers. I saw stickers like this used on 3-ring binders at an auto plant that was going through ISO registration. Are these stickers really needed.