Introduction individuals outside the limits of its own close-knit community? As long as the answer remains "virtually nothing," our work will generally be viewed as an ivory tower enterprise. As soon as the answer becomes a set of useful computer systems, we will be viewed as the people who produce such systems and who aspire to produce better ones. My point here is that the commercial marketplace will tend to judge both our science and our engineering in terms of our existing or potential engineering products. .
