ROBERT J. THIERAUF is Professor Emeritus of Information Systems at Xavier University, Cincinnati, Ohio. Previously a staff accountant and consultant at the then Coopers & Lybrand, he has written extensively on all facets of information systems, with particular attention to knowledgment management, online analytical processing, decision support, virtual reality, and other systems--most of which are explored in Dr. Thierauf's 13 previous Quorum books.