""Where there is delay the whole quality of justice deteriorates". Sometimes the deterioration in quality is palpable, as in the case where a crucial witness is dead or an important document has been destroyed. But sometimes, perhaps more often than we realise, the deterioration in quality is not recognisable even by the parties. Prejudice may exist without the parties or anybody else realising that it exists. . . . "what has been forgotten can rarely be shown". So, it must often happen that important, perhaps decisive, evidence has disappeared without anybody now "knowing" that it ever existed. Similarly, it must often happen that time will diminish the significance of a known fact or circumstance because its relationship to the cause of action is no longer as apparent as it was when the cause of action arose . . . the longer the delay in commencing proceedings, the more likely it is that the case will be decided on less evidence than was available to the parties at the time that the cause of action arose." ". . . the effect of delay on the quality of justice is no doubt one of the most important influences motivating a legislature to enact limitation periods . . . courts . . . have perceived four broad rationales for the enactment of limitation periods. First, as time goes by, relevant evidence is likely to be lost. Second, it is oppressive, even "cruel", to a defendant to allow an action to be brought long after the circumstances which gave rise to it have passed. Third, people should be able to arrange their affairs and utilise their resources on the basis that claims can no longer be made against them . . . the final rationale . . . is that the public interest requires that disputes be settled as quickly as possible."