It has been discussed earlier in this paper that after the removal of all dispensable attributes, the finalized decision table is independent, which is actually one of the many possible reducts of the originally constructed decision table. Therefore, attribute reduction is performed during the process of constructing the independent decision table with minimum cardinality. If an attribute is dispensable in all rules, then that attribute can be removed from the given data set. This process of removing attributes that do not contribute to the essential knowledge base is referred as feature selection.