"(i) The purpose of the subrule is to avoid the expense, delay and aggravation involved in protracted litigation arising out of taxation: Beach Petroleum v Johnson (No 2), at 120, per von Doussa J, applying Leary v Leary [1987] 1 All ER 261; Harrison v Schipp [200] NSWCA 213; [2002] NSWCA 213; (2002) 54 NSWLR 738, at 742 [21] per Giles JA.
(ii) An order that costs be assessed as a gross sum does not envisage that any process similar to that involved in taxation should take place. On the contrary, the Court applies a much broader brush than would be used on a taxation of costs pursuant to O 62: Beach Petroleum v Johnson (No 2), at 120, 124, per Doussa J; Harrison v Schipp, at 743 [22], per Giles JA.
(iii) The Court should be confident that the approach taken to the estimate of costs is logical, fair and reasonable. The Court should be astute to avoid both overestimating the recoverable costs and underestimating the appropriate amount, for example by applying an arbitrary discount to the amounts claimed: Beach Petroleum v Johnson (No 2), at 123, per von Doussa J.
(iv) Although the power to assess a gross sum for costs involves the exercise of a discretion, it is necessary to bear in mind fundamental principles applicable to an assessment of costs on a party and party basis. These include the principles contained in O 62 r 19 (embodying the 'necessary or proper' test) and those stated in Stanley v Phillips [1966] HCA 24; ) [1966] HCA 24; (1966) 115 CLR 470, at 478, per Barwick CJ (on a party and party taxation the emphasis is upon obtaining adequate representation to enable justice to be done, not upon the propriety of steps taken to ensure maximum success in the cause): Auspine Ltd v Australian Newsprint Mills Ltd [199] FCA 673; [1999] FCA 673; (1999) 93 FCR 1, at 4-5 [12]-[15], per O'Loughlin J; Charlick Trading Pty Ltd v Australian National Railways Commission [2001] FCA 629, at [6]-[8], per Mansfield J.
(v) Although the methodology permitted by O 62 r 4(2)(c) initially involves a broader approach than on a normal taxation, the provisions of O 62 and Sch 2 provide assistance in fixing an appropriate gross sum: Charlick Trading Pty Ltd v ANRC, at [10], per Mansfield J.