Many businesses have duplicate files on customers, projects, reference materials, etc. This has happened because no one can remember if the company already has a paper file on this subject and so, the easiest route is to just create another file. This results in a mess and everyone loses confidence in the filing system.
Paper Tiger has really neat features to let you and your staff automatically know if another file exists and makes it very easy to keep the filing straight as you go along with virtually no additional effort.