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Extensive analysis and testing with real time data of the AEP system for various types of equivalencing techniques has been performed. It was found that for real time on-line applications the REI-type equivalents performed better than other equivalencing methods (Ward-type equivalents). It is shown that the equivalent updating procedure used for REI-type equivalents cannot be used for Ward-type equivalents. Ward-type equivalents which performed well for off-line planning applications and for some simulated real time applications did not work as well under realistic on-line conditions.