In an application for reinstatement of a matter deemed to have lapsed for want of prosecution, the applicant must demonstrate good cause by satisfying three requirements: (i) explaining the extent of the delay, (ii) providing a reasonable explanation for the delay, and (iii) demonstrating prospects of success in the main matter. A delay of approximately 11 months after the stipulated period for setting down a matter is inordinate. An explanation for delay that is vague, unsubstantiated, and fails to explain why corrective action was not taken earlier or why the applicant did not inform the court of difficulties, is unreasonable. An applicant must adequately address prospects of success with particularity in the founding affidavit; vague references to documents without explaining their import or relevance is insufficient. An application for reinstatement rises or falls on the founding affidavit, and where fundamental issues are not candidly and comprehensively addressed, the application must fail. While courts have discretion to overlook procedural defects in form where no prejudice results (Rule 229C), substantive non-compliance with time limits prescribed by Practice Directions will not be condoned without proper justification.