Order VI Rule 17 CPC confers a wide discretionary power on civil courts to permit amendment of pleadings at any stage if the amendment is necessary for determining the real question in controversy between the parties. But this power is not unstructured: the court must weigh necessity, prejudice, limitation, due diligence, and the effect of the proposed amendment on the nature of the case.
A frequent question is whether a court can permit an amendment when the plea or relief sought to be introduced appears to be barred by limitation. The correct answer is: yes, in some cases; no, in others. There is no absolute prohibition against allowing a time-barred amendment, but a court should ordinarily decline such amendment when it introduces a fresh cause of action or a fresh relief that had already become barred on the date of the amendment application, because that would deprive the opposite party of a valuable accrued defence.

