Future directions in case base reasoning (CBR)
Conventional CBR has the limitation that it has no criterion for choosing the nearest cases based
on the probabilistic similarity of cases. The conventional CBR technique retrieves a fixed number
of neighbours in observational space. Thus, it always selects the same number of neighbours irrespective
of an optimal number of similar neighbours according to target cases. This fixed number
of neighbours raises a problem when some target cases should consider more similar cases while
others fewer ones. In addition, the whole issue of measuring similarity between cases is problematic,
especially when cases are represented as non-numeric components with complex relation
between components.