13 "Case-flow management principles" are the principles outlined in O 1 r 4A and r 4B of the Rules of the Supreme Court. Their objective is that of ensuring that the processes and procedures of the court are used in a way that will eliminate unreasonable delays in progressing actions towards trial: Hughes v Gales (1995) 14 WAR 434. They place greater emphasis than has generally been placed in the past upon the prejudice to a party in a general sense which stems from delay, recognising both the very significant stress and anxiety caused for litigants by the period of uncertainty prior to determination of litigation and the greater difficulty of accurately remembering or reconstructing events which is experienced as the passage of time increases (even where no specific prejudice, such as loss of a witness, can be proved). The principles also recognise a general prejudice to the public interest arising from unnecessary delays in litigation, as delays by one litigant tend to have the effect of increasing interlocutory procedures and increasing the difficulty of decision-making, thereby increasing public expense and, further, delays in the conduct of one piece of litigation may mean that the court is unable to give attention to the affairs of other litigants as expeditiously as it should. Those principles are given effect by the system of management by Registrars and, where appropriate, Judges, and by the setting of standard milestones against which the progress of the ordinary case may be judged.