An application for reinstatement of an appeal deemed dismissed for failure to file heads of argument within the prescribed 15-day period under Rule 37(2) of the Supreme Court (Magistrate Court) (Criminal Appeals) Rules 1979 requires the applicant to demonstrate good cause for extending the period. In determining whether good cause exists, the court must exercise its discretion judicially by considering and weighing all relevant factors including: the degree of non-compliance, the explanation for non-compliance, prospects of success on appeal, the importance of the case, the respondent's interest in finality of judgment, the convenience to the court, and avoidance of unnecessary delays in administration of justice. An applicant's failure to monitor the progress of their appeal for an extended period (3+ months) without reasonable explanation, coupled with dim prospects of success on appeal and flagrant disregard of court rules by legal practitioners, will not constitute good cause for reinstatement.