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There are a number of business rules engines on the market at the present time, and
they fill several different kinds of niches. Broadly speaking, they fall into two main
groupings. The first are basically inference engines, which can read information from
a database and operate rules in order to find answers to questions that users ask. The
second group is more concerned with deriving results that can be stored in a data-
base after the results have been calculated. All these rules engines are to some extent
generic and have some degree of acceptance in the current market. No doubt there
will be changes in the coming years as the market matures, and there is likely to be
increased product sophistication and differentiation.
There is another category ...