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The Object-Attribute-Value (OAV) model:
Expert systems gather data and draw inferences about physical or abstract
objects. These objects have one or more attributes and each attribute
can take on one or more values.
In the diagram below automobile is an object and
headlights is an attribute with possible values light and
don't light.
It is also possible for an object to
include other objects that in turn have their own attributes and values. A
more detailed automobile model might include an electrical system
object with attributes including headlights, starter and ignition.
Drawing OAV models of an expert system environment often provides
insights into the structure of an advising problem that will be useful
in formulating rules. The expert should help
develop the OAV model and should confirm its accuracy.
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