Abstract
This article first describes the NCR-USC Document Validation Laboratory, its corporate background, the mutual benefits it offers to National Cash Register (NCR) and the University of South Carolina (USC), and the validation procedure used therein. The article then goes on to discuss three common problems discovered in NCR's manuals and the reasons for these problems. The laboratory's success is then illustrated by presenting and analyzing excerpts from two documents that were validated in the laboratory and subsequently revised by NCR's writers before being revalidated.