ISBN : 978-81-963532-2-3 (E-Book) as they get agood insight into the working of the old system and also can compare the working of theirmodified systemwiththe oldsystem.Also,debugging of thereengineeredsystembecomeseasier as the programtraces of boththe systems canbecompared tolocalizethe bugs. Fig.25.1:Maintenanceprocessmodel1 116 Software Engineering Keerthana P, Manasa KN, Ganga D Bengal
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