how to validate and check its fitness. In this respect, Holmes
and Cunningham describe a typical case of KBS construction
where expert knowledge can debug and validate the set of rules
gathered from DM (Holmes & Cunninghan, 1993). The ‘‘Explora’’
data mining tool is used to build and maintain the ES. ‘‘Explora’’
is a statistics-based mining program that applies domain
knowledge and statistical measurements of the database to
identify patterns of attribute values and value combinations
that occur more or less frequently in the database. The discovered
knowledge is debugged and validated by the expert and
built into the ES.
DM can be applied