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- Expert systems take the form of software packages residing on a hardware
- platform (computer). The most common use of an expert system is via a man-
- machine dialogue. The user types something at the keyboard and the system
- replies. The user interface accepts the input. The input is parsed in some
- manner, the inference and knowledge engines process the user input in a
- predetermined manner and an output appears. The parsing function may be a
- simple pattern matching method commonly called keyword analysis, or a more
- complicated function using syntactic analysis. Keyword analysis is a logical
- function in which the presence of various keywords are detected. When a
- keyword is found, the system responds in the manner in which it has been
- programmed. For example, if the system detects the words "the wx" in a
- question, it may respond with " the wx here is sunny".
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