14 So far as the "reasonableness" of each party's action is concerned, that is of limited significance. It may be that the discretion as to costs should be exercised in some cases so as to penalise a party to litigation who has acted in a way which is wholly unreasonable, but the purpose of O 24A is to encourage the saving of public and private costs by promoting early and realistic offers, and early and realistic consideration of offers, of compromise. A party may well be acting "reasonably" in terms of its assessment of the facts or legal issues involved, or in relation to what it perceives as a tactical advantage in the course of litigation, and nevertheless refuse a fair and reasonable offer, with the consequences which flow pursuant to O 24A. Another way of putting this might be, broadly, that O 24A is concerned with the objective reasonableness of the offer in the light of the judgment ultimately pronounced, and not with the subjective reasonableness of a party's position at any particular time during the course of litigation. So, too, pursuant to the general discretion under O 66, a successful party may properly be deprived of an award of costs, and even on occasion ordered to pay the costs of an opponent in whole or in part where the successful party unnecessarily protracts the proceedings or otherwise by its conduct impedes the identification of real issues and the conduct of the trial in a way which increases costs. Again, the Court is concerned with the objective reasonableness of the parties' conduct.