After the half of 20th century, Software Industry has been grown up with tremendous high rate . Now a days softwares are used in almost every organizational activity . These systems should be maintained and evolved according to the new requirements and with the introduction of new hardware .For some systems it has been estimated that the eighty percent of total expenditures are consume just for evolving and maintenance . There is huge backlog of maintenance requests .So some organizations avoid to improve their system. Old systems that are still to be maintained are called "Legacy System". The a

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