From the developer: "On-the-fly quality control of QuarkXPress documents. QC XTension checks, fixes and collects files for output. It allows you to stay on top of your document's quality for the entire life cycle of the document, not only at the very end of the cycle. Among many firsts, QC is also the first to offer Merge Collect. This original function allows you to collect multiple related documents without creating redundant font and graphic files, making for much more compact archives."