When determining whether an applicant has shown 'good and sufficient cause' for rescission of a default judgment under Rule 63, the court must consider the three factors established in Stockill v Griffiths (reasonableness of explanation for default, bona fides of the rescission application, and bona fides of defence with prospects of success) not only individually but in conjunction with one another and with the application as a whole. An applicant can discharge the onus even where the explanation for default is weak, if the other factors when considered together establish good and sufficient cause. In rescission applications, the applicant is not required to prove the case on the merits but merely to show a bona fide defence carrying prospects of success. Courts should favor substantive justice and not allow parties to be shut out on technicalities where the interests of justice require full interrogation of the issues at trial.