A court has inherent power, both at common law and under s 173 of the Constitution, to dismiss an action for want of prosecution where there is inordinate delay that constitutes an abuse of the court's process. For dismissal to be justified, three requirements must be met: (1) there must be delay in prosecuting the action; (2) the delay must be inexcusable; and (3) the defendant must be seriously prejudiced thereby. The inquiry involves examination of all relevant circumstances including the period of delay, reasons for it, prejudice to the defendant, and the defendant's own conduct. While a defendant's inactivity is a relevant factor, it must be viewed in context of the plaintiff's overall failure to prosecute. The cumulative effect of unnecessary delay is determinative - if the delay creates a substantial risk that a fair trial will not be possible due to loss of evidence, witnesses, or documents, dismissal is warranted. The constitutional right of access to courts under s 34 may be justifiably limited to prevent abuse of process and protect the administration of justice.