On Interface Requirements for Expert Systems

The user interface to a software system can spell the difference between success and failure. Sometimes, function does not seem to count. If the program does a good enough job, if the users see an easy to use, easy to learn, helpful, pleasant interface, they love it. The interface might be the most significant sales aspect of a software product (consider the spate of look-and-feel lawsuits!). This wasn't always the situation.