"43. The extent of the obligation…is informed by the general law concerning the duty of judicial officers to give reasons for their decisions discussed in cases such as Soulemezis v Dudley (Holdings) Pty Ltd (1987) 10 NSWLR 247, Mifsud v Campbell (1991) 21 NSWLR 725 and Beale v Government Insurance Office of New South Wales (1997) 48 NSWLR 430. The extent of a judicial officer's duty depends on the circumstances. Whether or not a costs assessor and a panel are acting administratively or judicially, which was left open in Attorney-General of New South Wales v Kennedy Miller Television Pty Ltd, the extent of their duties must take into account the different nature of their task and their roles as legal practitioners bringing to bear their experience and judgment in evaluation of what work was reasonable and what is a fair and reasonable amount of costs; but it is also moulded by the basis for the obligation to give reasons in Attorney-General of New South Wales v Kennedy Miller Television Pty Ltd, thereafter taken up by the legislature.
44. The reasons must be such that a party dissatisfied with the costs assessor's or panel's determination "should have a real and not largely illusory right of appeal". These words in Attorney-General of New South Wales v Kennedy Miller Television Pty Ltd at 735 were qualified by "in regard to questions of law at least", but in my respectful opinion they apply equally to questions of fact: questions of whether the time engaged or an hourly rate are reasonable can be very important, and although subject to leave s 208M permitted an appeal on those questions. The filter for an appeal as to fact is the Court's decision as to leave, not the cost assessor's or panel's expression of reasons, and whether leave should be granted can only be decided if it is known why the determination was made.
45. The delay and expense of an excessively onerous obligation to provide reasons is material, particularly when assessment of costs by costs assessors was intended to provide a faster, easier and cheaper system. In my opinion, however, the observations of Meagher JA in Beale v Government Insurance Office of New South Wales at 444 are applicable; that the balancing act in considering the sufficiency of a statement of reasons "involves the adoption of, at the least, a minimum standard which places the parties in a position to understand why the decision was made sufficiently to allow them to exercise any right of appeal".
24. Particularly relevant in the present appeal are statements in the lead judgment of Giles JA in Frumar at [59] - [63] where the reasons of the Costs Assessor were criticised for their failure to identify what work, by reference to items, was disallowed:
"59. … it can not be seen what work the costs assessor thought was or was not reasonable work to be carried out, including by way of coordination work and reporting work, or its relationship to the work in the items in the bill of costs.