[21] The joint judgment in Cobiac v Liddy establishes that the list of relevant considerations for determining the issue of "expediency" is broader than the list of matters specifically listed as factors to which the court must have regard.
[22] The breadth of the discretion is confirmed in the judgment of Windeyer J where his Honour said (at CLR 276; ALR 648):
... the magistrate must be of opinion that the exercise of the power is expedient because of the presence and effect of one or more of the stated conditions, namely character, antecedents, age, health or mental condition. One of these by itself, or several taken together, must provide a sufficient ground for a reasonable man to hold that it would be expedient to extend the leniency which the State statute permits. The Act speaks of the court exercising the power it confers "having regard to" the matters it states. I read that as meaning more than merely noticing that one or more of them exists. Its, or their, existence must, it seems to me, reasonably support the exercise of the discretion the statute gives. They are not mere pegs on which to hang leniency dictated by some extraneous and idiosyncratic consideration. But they are wide words. None of the matters they connote is necessarily to be regarded in isolation from the others, or apart from the whole of the circumstances of the offender and the offence.
[23] This last reference to the "whole of the circumstances of the offender and the offence" opens up a wide range of factors as relevant to the exercise of the statutory discretion. It appears that his Honour, like the judges who signed the joint judgment, did not take a narrow view of the scope of relevant considerations, notwithstanding his Honour's reference to the need for one or other of the specified factors to themselves be of sufficient significance to justify the finding of the expediency.
[24] There may be a difference in approach between the joint judgment and that of Windeyer J. (See Paterson v Fenwick [1994] ACTSC 25; (1994) 115 FLR 462 at 468-9.) Windeyer J appears to apply a test that one of the specified matters must of itself justify the finding of inexpediency, but that in determining that question the full range of relevant considerations may be taken into account. The joint judgment proceeds on the basis that any matter relevant to the issue of expediency can be taken into account in the ultimate exercise of the discretion, whether or not that factor itself falls within one of the facts and matters specified in the respective subparagraphs of 19B(1)(b).
[25] As a practical matter, there may be little difference between the two approaches because of the reference Windeyer J made to the "whole of the circumstances of the offender and the offence", together with the broad approach his Honour took to the scope of "antecedents".
[26] Windeyer J's reference to the relevance of "the whole of the circumstances of the offender and the offence" has been reflected in a number of subsequent decisions. (See for example Aikman v Bourne (1992) 63 A Crim R 467 at 470 per Cox J; McQuestin v Australian Securities Commission [1993] TASSC 118; (1993) 2 Tas R 30 at 36-7; 12 ASCR 279 at 283 per Underwood J.)