To resist an application for summary judgment, a defendant must allege facts which, if established at trial, would constitute a defence to the plaintiff's claim. The defendant need only show "a mere possibility of success," "a plausible case," "a triable issue," or that "there is a reasonable possibility that an injustice may be done if summary judgment is granted." The defendant's affidavit must disclose the nature of the defence and material facts with sufficient clarity and completeness, but need not deal exhaustively with evidence. Where documentary evidence (payslips, receipts, board minutes) supports a defence and creates factual disputes about the nature and performance of agreements, summary judgment is inappropriate and the matter should proceed to trial.