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87. The law on "due diligence" developed till this date is summarized as under :

(a) "Due diligence" means careful and persistent application and effort. It means the diligence as a prudent man would exercise in the conduct of his own affairs. Unless the party takes prompt steps, mere action cannot be accepted after the commencement of the trial. The due diligence determines the scope of party's constructive knowledge of the claim. It is a kind of reasonable investigation, which is necessary before claiming the relief.