Sufficient cause: requires an adequate, non negligent explanation for delay before discretionary condonation is granted. The document explains that 'sufficient cause' requires an adequate explanation for delay excluding negligence, inaction or lack of bona fides, and that courts must scrutinise such explanations to ensure they are not devices to cover ulterior motives; liberal interpretation is available only where negligence or mala fide conduct cannot be imputed, and the expression cannot be used to justify prolonged or unexplained delays contrary to the policy of speedy dispute resolution.