The integrated theory TI is constructed on the basis of the candidate set TC. Initially set TC contains all the rules of the individual theories T1..Tn. The objective is to select some rules from TC and transfer them into TI so as to achieve good performance (accuracy). The method relies on the qualitative and quantitative characterization of rules and includes the following steps:
(1) Order rules in the candidate set according to their estimates of quality.
(2) Select the rule R with the best quality and include it in TI.
(3) Mark the cases covered by R.
(5) Recalculate the quality estimates of rules excluding the marked cases.
(6) Go back to (1).
The process of adding new rules to TI terminates when the accuracy of the 'best rule' in TC falls below a certain threshold.