Consistency/Parity
Consistency requires like cases should be treated alike (Wong v R (2001) 207 CLR 584).
Sentences should be in line with precedents/fall within the relevant range (but this is limited by individualisation).
Parity usually refers specifically to co-offenders. “It is obviously desirable that persons who have been parties to the …same offence should, if other things are equal, receive the same sentence, but other things are not always equal and such matters as age, background, previous criminal history and general character of the offender, and the part which he or she played in the commission of the offence, have to be taken into account” (Gibbs CJ in Lowe (1984) 154 CLR 606 at 609).
"[E]qual justice requires that, as between co-offenders, there should not be a marked disparity which gives rise to a ‘justifiable sense of grievance’… a sentence should be reduced where there is such a marked disparity, notwithstanding that it is otherwise appropriate and within the permissible range of sentencing options” (R v Nagy [2003] QCA 175 at 49).