Many theoretical and experimental studies have shown that a multiple classi'er system is an e'ective technique for reducing prediction errors 9,10,11,20,19]. These studies identify mainly three elements that characterize a set of cl- si'ers: -Therepresentationoftheinput(whateachindividualclassi'erreceivesby wayofinput). -Thearchitectureoftheindividualclassi'ers(algorithmsandparametri- tion). - The way to cause these classi'ers to take a decision together...