25 His Honour then referred to the judgment of Burchett J in One Tel Ltd v Commissioner of Taxation (2000) 101 FCR 548, who made the point in these terms:
"It is accepted that, in a case which terminates before there has been a hearing, the court should not resolve the issue of costs by engaging in something in the nature of a hypothetical trial: Australian Securities Commission v Aust-Home Investments Ltd (1993) 44 FCR 194 at 201; Re Minister for Immigration and Ethnic Affairs ; Ex parte Lai Qin (1997) 186 CLR 622 at 624. But this does not mean that the Court never make an order for costs. Often, it will be unable to do so; but in other cases an examination of the reasonableness of the conduct of the parties, respectively, may provide the basis of an order, or a 'judge may feel confident that, although both parties have acted reasonably, one party was almost certain to have succeeded if the matter has been fully tried', as McHugh J put it in Ex parte Lai Qin at 625. His Honour added:
'If it appears that both parties have acted reasonably in commencing and defending the proceedings and the conduct of the parties continued to be reasonable until the litigation was settled or its further prosecution became futile, the proper exercise of the cost discretion will usually mean that the court will make no order as to the cost of the proceedings.'
Although his Honour thought this would 'usually' be so, he made it clear that he was not laying down an invariable rule. At the beginning of his discussion of the applicable principles (at 624), he referred to the discretionary nature of the power to order costs, and to the 'general rule [that] the successful party is entitled to his or her costs', and he said:
'In an appropriate case, a court will make an order for costs even when there has been no hearing on the merits and the moving party no longer wishes to proceed with the action.'
As Sackville J pointed out in Rizal v Minister for Immigration and Multicultural Affairs [1999] FCA 334 at [16], the remarks made by McHugh J evince 'a somewhat more flexible approach' than that taken by the Court in Gribbles Pathology Pty Ltd v Heath Insurance Commission (1997) 80 FCR 284 at 287, when it suggested that 'there will be very few cases, where the issues will be sufficiently clear, in the absence of a hearing, for an order for costs to be made in favour of a party.' What is well established is that frequently the determining factor will be the reasonableness of the conduct of the parties, a matter which was emphasised in each of the decision I have cited, and also in Reddy v Hughes (1996) 37 IPR 413; Sun Zhan Qui v Minister for Immigration and Ethnic Affairs [1999] FCT 119; and Australian Securities Commission v Berona Investments Pty Ltd 18 ASCR 772. In the last case, Cooper J commented, concerning the principles laid down in Australian Securities Commission v Aust-Home Investments (at 774):