"[74] ... the reasons of the Court of Criminal Appeal suggest a mathematical approach to sentencing in which there are to be 'increment[s]' (R v Wong [1999] NSWCCA 420; (1999) 48 NSWLR 340 at 365 [141]) to, or decrements from, a predetermined range of sentences. That kind of approach, usually referred to as a 'two-stage approach' to sentencing, not only is apt to give rise to error, it is an approach that departs from principle. It should not be adopted.
[75] It departs from principle because it does not take account of the fact that there are many conflicting and contradictory elements which bear upon sentencing an offender. Attributing a particular weight to some factors, while leaving the significance of all other factors substantially unaltered, may be quite wrong. We say 'may be' quite wrong because the task of the sentencer is to take account of all of the relevant factors and to arrive at a single result which takes due account of them all. That is what is meant by saying that the task is to arrive at an 'instinctive synthesis' (R v Williscroft ]1975] VR 292 at 300, per Adam and Crockett JJ. See also R v Thomson (2000) 49 NSWLR 383). This expression is used, not as might be supposed, to cloak the task of the sentencer in some mystery, but to make plain that the sentencer is called on to reach a single sentence which, in the case of an offence like the one now under discussion, balances many different and conflicting features.
[76] In R v Thomson (2000) 49 NSWLR 383 at 396-411 [54]-[113], Spigelman CJ reviewed the state of the authorities in Australia that deal with the 'two-stage' approach of arriving at a sentence, in which an 'objective' sentence is first determined and then 'adjusted' by some mathematical value given to one or more features of the case, such as a plea of guilty or assistance to authorities. As the reasons in Thomson reveal, the weight of authority in the intermediate appellate courts of this country is clearly against adopting two-stage sentencing and favours the instinctive synthesis approach (R v Geddes (1936) 36 SR (NSW) 554 at 555, per Jordan CJ; R v Gallagher (1991) 23 NSWLR 220 at 227-228, per Gleeson CJ;; at 233-234, per Hunt J; R v Beavan (unreported; Court of Criminal Appeal (NSW); 22 August 1991); R v Winchester (1992) 58 A Crim R 345 at 350, per Hunt CJ at CL; R v Williscroft [1975] VicRp 27; [1975] VR 292 at 300; R v Young [1990] VicRp 84; [1990] VR 951 at 955-956; R v Perrier [No 2] [1991] VicRp 38; [1991] 1 VR 717; R v O'Brien (1991) 55 A Crim R 410; R v Nagy [1992] VicRp 45; [1992] 1 VR 637; R v Harman [1989] 1 Qd R 414 at 421, per de Jersey J; R v Corrigan [1994] 2 Qd R 415; Pavlic v The Queen [1995] TASSC 96; (1995) 5 Tas R 186; cf R v Sutherland (unreported; Court of Criminal Appeal (SA); 16 November 1992); R v Harris [1992] SASC 3624; (1992) 59 SASR 300; Verschuren v The Queen (1996) 17 WAR 467). In this Court, McHugh and Hayne JJ, in dissenting opinions in AB v The Queen [1999] HCA 46; (1999) 198 CLR 111 at 121-122 [15]- [18], per McHugh J; at 156 [115], per Hayne J expressed the view that the adoption of a two-stage approach to sentencing was wrong. Kirby J expressed a contrary view (AB v The Queen [1999] HCA 46; (1999) 198 CLR 111 at 148-149 [99]- [100]). We consider that it is wrong in principle. The nature of the error can be illustrated by the approach adopted by the Court of Criminal Appeal in these matters. Under that approach, the Court takes, for example, the offender's place in the hierarchy and gives that a particular significance in fixing a sentence but gives the sentencer no guidance, whatever, about whether or how that is to have some effect on other elements which either are to be taken into account or may have already been taken into account in fixing the guideline range of sentences. To take another example, to discount' a sentence by a nominated amount, on account of a plea of guilty, ignores difficulties of the kind to which Gleeson CJ referred in R v Gallagher (1991) 23 NSWLR 220 at 228 when he said that: