OPINION
BURKE, Justice.Following his conviction for first degree assault, the superior court sentenced Michael Alan Wentz to a fifteen year term of imprisonment with three years suspended. Wentz appealed, claiming that his sentence was too severe. The court of appeals concluded that the superior court was clearly mistaken and ordered its sentence modified to fifteen years with five years suspended.1 We reverse.
I
Wentz was convicted, after pleading no contest to a single count of first degree assault,2 for injuries inflicted upon his wife, *963F.S. Wentz v. State, 777 P.2d 213, 214 (Alaska App.1989). Wentz apparently believed that his wife had had sexual intercourse with another man. Id. In an intoxicated state, he severely beat F.S., fracturing her skull and causing other serious injuries. Id. Wentz did not secure medical assistance for F.S. until approximately seven hours after the beating. Id.
As a result of the assault, F.S. required protracted hospitalization and suffered permanent brain damage. Id. Her injuries were particularly dangerous to F.S. because she suffered from a serious heart condition that made her vulnerable to infection. Id. F.S. had been scheduled to undergo open heart surgery in January 1988, to replace a faulty heart valve. Id. The surgery was postponed because of her injuries. Id. In addition, F.S. was deaf and mute. Id.
At the time of sentencing, approximately six months after the assault, F.S. was still confined to a nursing home. Id. Although her condition had improved, F.S. still had no immediate prospect of being discharged. Id.
Wentz was thirty-two years old when he committed the offense. Id. Although he had never been convicted of a felony, Wentz had twelve prior misdemeanor convictions. Id. Three of these were for as-saultive conduct, one involving an assault upon F.S. Id. All of Wentz’s prior offenses appear to have been alcohol related, reflecting his long-standing problem with alcohol abuse. Id. On four prior occasions, Wentz had completed male awareness programs. Id. Despite his numerous misdemeanor convictions, Wentz had never served any significant period of time in jail. Id. He was on informal probation for his most recent misdemeanor conviction, a fourth-degree assault, when he committed the current offense. Id. at 215.
Before imposing sentence, the trial court found two aggravating factors to be applicable: first, Wentz committed the offense upon his spouse, AS 12.55.155(c)(18); second, Wentz committed the offense knowing that F.S. was particularly vulnerable by virtue of her heart condition and deafness, AS 12.55.155(c)(5). Id.3 The court also relied on Wentz’s prior misdemeanor record and his continued problems with alcohol abuse, concluding that Wentz was a dangerous offender and that his prospects for rehabilitation were poor. Id. Based on these conclusions, and upon the seriousness of Wentz’s current charge, the court concluded that a sentence significantly exceeding the five-year presumptive term was necessary for the protection of the community. Id. Accordingly, the court sentenced Wentz to a term of fifteen years with three years suspended. Id.
The court of appeals held that an actual term of imprisonment in excess of ten years was inconsistent with its own decisions limiting to ten years the maximum prison term for certain class A and class B felonies. Id. at 215-16. Specifically, the court relied upon its ruling in Pruett v. State, 742 P.2d 257, 264 (Alaska App.1987), where the court held:
Sentences of ten years or more for conduct equivalent in seriousness to class A felonies under current law have generally been based on isolation as a goal of sentencing and have been reserved for those with a proven record of recidivism, or those whose conduct involved premeditated attempts to kill or seriously injure.
(emphasis added). The court also relied upon Holtzheimer v. State, 766 P.2d 1177, 1180 (Alaska App.1989), which refines somewhat the “proven record of recidivism” language of Pruett. Holtzheimer states:
In cases involving class A and class B felonies, we have consistently recognized that composite terms exceeding ten years of imprisonment should be reserved for offenders who have prior felony records *964and who have spent substantial periods of time in prison.
Id. at 1180 (emphasis added).
The court concluded that Wentz’s case failed to fit under either exception to the ten-year sentence cap established in Pruett, Holtzheimer, and other cases. Wentz, 777 P.2d at 216.4 Accordingly, it reversed the trial court’s sentence of fifteen years with three suspended, and remanded with directions that a new sentence be imposed not exceeding fifteen years with five years, rather than three, suspended. Id. at 216-17. We granted the state’s petition for hearing.
II
Assault in the first degree is a class A felony. AS 11.41.200(b). In AS 12.55.-125(c) the legislature has declared class A felonies to be subject to a maximum prison term of 20 years; however, the presumptive term for first felony offenders, “subject to adjustment” for aggravation and mitigation, is five years imprisonment. AS 12.55.125(c)(1). Where aggravating factors are found, the sentencing court is authorized to “increase the presumptive term up to the maximum term of imprisonment.” AS 12.55.155(a)(2).
When considering the appropriate adjustment of sentence for an offender based upon a finding of aggravating or mitigating circumstances, the trial court is to consider the following factors: (1) the seriousness of the defendant’s present offense in relation to other offenses; (2) the prior criminal history of the defendant, and the likelihood of rehabilitation; (3) the need to confine the defendant to prevent further harm to the public; (4) the circumstances of the offense, and the extent to which the offense harmed the victim, or endangered the public safety or order; (5) the effect of the sentence to be imposed in deterring the defendant or other members of society from future criminal conduct; and (6) the effect of the sentence to be imposed as a community condemnation of the criminal act, and as a reaffirmation of societal norms. AS 12.55.005; State v. Chaney, 477 P.2d 441, 444 (Alaska 1970). The priority and relative weights of these criteria are left to the discretion of the sentencing judge, Nukapigak v. State, 663 P.2d 943, 945 (Alaska 1983), and the sentence imposed by the trial court may be reversed only where the appellate court, after independent review of the record, “is convinced that the sentencing court was clearly mistaken in imposing a particular sentence.” State v. Graybill, 695 P.2d 725, 729 (Alaska 1985) (quoting McClain v. State, 519 P.2d 811, 813 (Alaska 1974)).
Applying the foregoing principles to the case at bar, it is apparent that the trial court was permitted, under AS 12.55.-155(a)(2), to increase Wentz’s five-year presumptive term by as much as fifteen years, depending upon the number and severity of statutory aggravating factors present, and the appropriate weight to be afforded the various, legislatively authorized criteria for adjustment of sentence under AS 12.55.005. After considering these criteria, and finding two statutory aggravating factors to be present, the trial court sentenced Wentz to fifteen years with three years suspended. Wentz’s total term of imprisonment was, therefore, five years less than the statutory maximum, and his term of actual imprisonment was eight years less than that amount.
The court of appeals, nonetheless, concluded that the trial court was “clearly mistaken” in sentencing Wentz to fifteen years with three suspended, holding that it should have sentenced him, instead, to no more than fifteen years with five suspended. Wentz, 777 P.2d at 217. As already noted, the decision was based upon the *965court of appeals’ own cases holding that “composite terms exceeding ten years of imprisonment” for class A and class B felonies are “reserved for” cases in which the defendant either (1) “[has a] prior felony record[] and [has] spent substantial periods of time in prison” or (2) has engaged in “conduct involving] premeditated attempts to kill or seriously injure.” Wentz, 777 P.2d at 216 (quoting Holtzheimer, 766 P.2d at 1180 and Pruett, 742 P.2d at 264). We believe that the court of appeals’ “ten-year rule” is both inconsistent with the statutory scheme established by the .legislature and contrary to our prior decisions concerning the proper role of the appellate courts in reviewing sentencing decisions.
It is certainly not apparent that any such limitation was intended by those enacting the legislative scheme which the court of appeals professes to advance. Indeed, the statutory language itself provides that, where statutory aggravating factors are present, the presumptive five-year sentence for first felony offenders may be increased from one to fifteen years, in the sound discretion of the sentencing court, subject only to the strictures of AS 12.55.-005. The practical effect of the court of appeals’ ten-year limitation, in this case and others like it, is to reduce by two-thirds the range of acceptable sentences expressly authorized by the legislature in this context.
Under the rule applied by the court of appeals in this case, a first time felony offender would never receive more than half the maximum term of imprisonment, unless one of the specific aggravating factors deemed sufficient by the court of appeals is present. However, the court’s abbreviated list of aggravating factors (which includes only prior felony offenses and “premeditated attempts to kill or injure”) is in direct conflict with the more lengthy list of aggravating factors which the legislature has proclaimed sufficient. The legislative scheme allows imprisonment for up to twenty years for class A felonies, upon proof of one or more of twenty-six enumerated aggravating factors. See AS 12.55.125; AS 12.55.-155(c)(l)-(26). Under the court of appeals’ ruling, a trial court cannot sentence an offender to the maximum term, regardless of the presence, strength, or number of statutory aggravating factors, unless it can demonstrate that the case meets one of the two exceptions to the court of appeals’ ten-year rule. We hold that such a result is in direct conflict with the language of the statute and is therefore impermissible.
In simple terms, the legislature, as part of its comprehensive sentencing scheme, has directed that a sentence may be adjusted “up to the maximum,” under specified circumstances. The court of appeals’ implicit conclusion that the legislature meant “up to the maximum only where an offender has committed prior felonies and served substantial jail time, or where the crime involves premeditated attempts to kill or seriously injure ” is at odds with the plain language of the statutory scheme.
The court of appeals’ result is also at odds with the “clearly mistaken” standard of review established long ago by this court in McClain v. State, 519 P.2d 811, 813-14 (Alaska 1974). In McClain, we recognized that, “[analytically, the clearly mistaken test implies a permissible range of reasonable sentences which a reviewing court, after an independent review of the record, will not modify.” Id. at 813 (emphasis added). This “range of reasonableness,” we believe, should be determined not by imposition of an artificial ceiling which limits a large class of offenses to the lower end of the sentencing spectrum, but, rather, by an examination of the particular facts of the individual case in light of the total range of sentences authorized by the legislature for the particular offense.
We have recognized that “the maximum sentence for a particular offense expresses a legislative judgment about how the worst offender within a class designated by the legislature should be treated.” Waters v. State, 483 P.2d 199, 201 (Alaska 1971); see also Walls v. State, 598 P.2d 949, 950-51 (Alaska 1979). Conversely, the presumptive term for a given offense represents a legislative determination of the minimum sentence appropriate for that offense in the absence of aggravating or mitigating cir*966cumstances. See Smith v. State, 711 P.2d 561, 567 (Alaska App.1985) (in absence of aggravating or mitigating factors an individual sentencing judge has no discretion to deviate from presumptive term). Between these extremes, lies a wide range of potential sentences. Those in the upper end of the spectrum should, of course, be reserved for more serious offenses and offenders, while those in the lower end are appropriate for less grave criminal offenders and criminal conduct.
Whether a particular offense is sufficiently serious to justify placing it in the upper rather than lower end of the sentencing range, however, cannot be determined with mathematical certainty. Such questions are not easily resolved by resort to “bright line” rules or pronouncements concerning the “correct” sentence to be applied under varying factual circumstances. For example, it cannot be stated categorically that a felony assault committed by an offender with a long string of prior misdemeanor assaults is necessarily less serious than a felony assault committed by an offender with a single prior felony conviction. Such questions must be answered by reference to the particular facts of the individual case, and are therefore matters properly left to the sound discretion of the sentencing judge. See Nukapigak, 663 P.2d at 945 (priority and relative weights of sentencing criteria are left to discretion of sentencing judge); Padie v. State, 594 P.2d 50, 62 (Alaska 1979) (superior court “retains broad discretion in sentencing” under Chaney criteria).
As we observed in Creer v. State, 600 P.2d 1095 (Alaska 1979), “[sjentencing must be based on the facts of the particular offense and the history of the individual defendant.” Id. at 1095-96. We believe that the rigid approach applied by the court of appeals in the instant case tends to undercut this principle by artificially grouping substantially different offenses and offenders together in the lower end of the authorized sentencing range. Accordingly, the ten-year rule applied by the court of appeals in the instant case is disapproved.5
In so ruling, we do not mean to suggest that the court of appeals may not adopt any standards in order to guide the trial courts in the exercise of their discretion in sentencing.6 On the contrary, in Karr v. *967State, 686 P.2d 1192, 1195 (Alaska 1984), we applied, without disapproval, the court of appeals’ longstanding “Austin rule,” which provides that “[n]ormally a first offender should receive a more favorable sentence than the presumptive sentence for a second offender.” Austin v. State, 627 P.2d 657, 657-58 (Alaska App.1981). As the court of appeals observed in Austin, however, the rule announced therein did not suggest “that a first offender [may] never receive more time to serve than the presumptive term for a second offender”; it merely limited application of the higher term to the “exceptional case.” Id. at 658.
Properly applied the “exceptional case” standard enunciated in Austin allows the trial court sufficient discretion to exceed the presumptive term for second felony offenders where a particularly compelling set of aggravating factors (AS 12.55.155) or Chaney criteria (AS 12.55.005) militate in favor of an increased sentence. We believe that the case before us clearly represents an “exceptional case” which, under the Austin rule, justifies a sentence for a first felony offender in excess of the presumptive term for a second felony offender.7
The victim in this case, Michael Wentz’s wife, is deaf and mute, with a congenital heart condition which makes her particularly vulnerable to assault. Wentz, apparently in a jealous rage aggravated by alcohol, beat her so severely that she was required to spend 112 days in the hospital, 56 of those in intensive care. Despite her moans of pain, Wentz failed to secure any medical assistance for his wife until approximately seven hours after the incident, when it became apparent to Wentz that she might die. Wentz’s wife suffered permanent brain damage, which had manifested itself, at the time of sentencing, in memory lapses and a difficulty in walking.
This was not Wentz’s first incident of alcohol-related violence; it was not even the first time he had been convicted of beating his wife. In July 1987, Wentz pled no contest to assault in the fourth degree for choking and striking his wife. In December of 1987, Wentz was again convicted of assault in the fourth degree, this time for attacking a bartender who attempted to intervene while Wentz was “pushing [his wife] around” in a bar.
Before these events occurred, Wentz had amassed a substantial record of alcohol-re*968lated misdemeanor offenses, including numerous instances of disorderly conduct and property damage. Also, as noted by the trial court, Wentz failed four separate alcohol rehabilitation efforts, and his drinking clearly “manifest[ed] itself in ... violent behavior.”
Given these circumstances, it cannot reasonably be said that the trial court was clearly mistaken when it suspended three rather than five years of Wentz’s fifteen-year sentence. See generally Karr, 686 P.2d at 1195 (“degree of harm inflicted upon the victim” and “magnitude and manner” of crime relied upon to find case “exceptional” under Austin rule); Walls, 598 P.2d at 951 (defendant’s “repeatedf ] fail[ure] to respond to ... rehabilitative efforts” and lack of “inclination or motivation to control his admitted [alcohol and drug] abuse” relied upon to find defendant a “worst offender” subject to maximum sentence); Hansen v. State, 657 P.2d 862, 864 (Alaska App.1983) (defendant’s “long record of misdemeanor offenses” involving alcohol-related assaults, thefts, and disorderly conduct rendered offense an “exceptional case” under Austin). Accordingly, the court of appeals’ decision is REVERSED and this case is REMANDED with instructions that the trial court’s sentence of fifteen years with three years suspended be reinstated.
MATTHEWS, C.J., with whom RABINOWITZ, J., joins dissenting,
. With only minor alterations and omissions, we reiterate here the version of the facts outlined by the court of appeals in Wentz v. State, 777 P.2d 213 (Alaska App.1989).
. Wentz was convicted of violating AS 11.41.-200(a)(1) (recklessly causing serious physical injury by means of a dangerous instrument). Wentz, 777 P.2d at 214. The maximum penalty for this offense is 20 years imprisonment; the presumptive term for a first felony offender is five years imprisonment. AS 12.55.125(c).
. The court rejected one aggravating factor proposed by the state: that Wentz's conduct was among the most serious within the definition of the offense, AS 12.55.155(c)(10). Wentz, 777 P.2d at 21.5. The court concluded that F.S.’s injuries were not sufficient to establish this aggravating factor by clear and convincing evidence. Id.
. The court explicitly distinguished this case from Sweetin v. State, 744 P.2d 424 (Alaska App.1987), wherein the court upheld a 31-year sentence with five years suspended for a defendant convicted of two first degree assaults, one third degree assault, and one count of criminal non-support. The court of appeals observed that Sweetin involved "particularly egregious act[s] of deliberate cruelty” which fell within that class of offenses characterized in Pruett as "premeditated attempts to kill or seriously injure," whereas Wentz’s crime "was impulsive rather than deliberate and premeditated.” Wentz, 777 P.2d at 216.
. The court of appeals based its ten-year standard, in large part, upon the ABA Standards for Criminal Justice, on Sentencing Alternatives and Procedures (1980), which would permit imposition of a sentence in excess of ten years only where the defendant has been convicted of two or more prior felonies and has served at least one year in prison within the preceding five years. Id. at §§ 18 — 2.1(e), 18-4.4(c). Although we have often cited the ABA Standards with approval in the past, see, e.g., Pascoe v. State, 628 P.2d 547, 550 (Alaska 1980); Donlun v. State, 527 P.2d 472, 475 (Alaska 1974), we have also stated that “the ABA Standards are not a code which we are bound to follow in all circumstances,” Davis v. State, 566 P.2d 640, 644 (Alaska 1977), and that "we will evaluate the individual case to determine if the [ABA Standard] is appropriate.” Grayhill, 695 P.2d at 729. Where, as here, the ABA Standards tend to conflict with the presumptive sentencing scheme established by the legislature, the latter will prevail.
We note also that our own decision in Pears v. State, 698 P.2d 1198 (Alaska 1985) is not controlling here. In Pears, the court reversed as excessive a twenty-year sentence for second degree murder and second degree assault arising out of an automobile accident caused by an intoxicated driver. Id. at 1205. Two members of the three-justice majority stated that they “believe[d] that the maximum sentence imposed should not exceed ten-years’ imprisonment” under the facts of that case. Id. at 1205 n. 15. Presumably, this was intended as a fact specific suggestion. It may now have achieved an elevated importance as the court of appeals attempts to interpret the third justice's silence on the question of an appropriate maximum. See, e.g., Jones v. State, 744 P.2d 410, 413-16 (Alaska App.1987). The court’s holding in Pears, however, was based upon the particular facts before us therein, and we believe that attempts to extend either the holding or the dicta of the Pears decision beyond the facts of that case would be in error.
. "The court of appeals has jurisdiction to hear appeals of sentences of imprisonment by the superior court on the grounds that the sentence is excessive or too lenient ...AS 22.07.020(b), and "[a] final decision of the court of appeals is binding on the superior court ... unless superseded by a decision of the supreme court,” AS 22.07.020(g). The court of appeals, however, has no authority to promulgate general rules of practice and procedure in those courts. Only this court has such authority. Lee v. State, 374 P.2d 868, 869 (Alaska 1962); Alaska Const. art. IV, § 15. Moreover, as was observed in a recent article appearing in the Alaska Law Review,
*967There are drawbacks ... to relying too heavily on appellate review to articulate sentencing principles and to fine-tune sentences. Appellate review by its very nature is backward-looking. It is the proper role of the appellate court to examine what has occurred in a specific case, and to pass on the propriety of the result in that case only. It is generally accepted that an appellate court is effective only when it decides cases based on the factual record before it and only after the record in that case has been completely developed. As a rule, it cannot and should not anticipate what other factual situations might arise in the future, nor should it fashion rules prospectively.
... [T]he court of appeals, ... creates target benchmarks by looking back and reviewing sentences previously approved in similar cases. It then synthesizes all the cases in that area, often publishing a decision making explicit the reasoning implicit in its previous decisions. While this is entirely appropriate behavior for an appellate court, it means that the court of appeals cannot shape sentencing law prospectively, because it cannot choose the cases that come before it, and it cannot decide cases with an eye to what might happen in the future. In addition, the court’s process of deciding numerous cases in an area and then publishing a decision distilling the general principle is often confusing to the practitioner, who is sometimes left with dozens of cases and no concrete rule.
It is the function of a legislature to shape law prospectively. Besides being able to look forward, a legislature can establish sentencing policy in the context of other considerations, such as the overall allocation of the state’s resources. This legislative function complements the appellate courts' review of individual cases and synthesis of the individual decisions into a comprehensive set of interpretations of the statutes and constitution.
DiPietro, The Development of Appellate Sentencing Law in Alaska, 7 Alaska L. Rev. 265, 296 (1990).
. Although the dissent suggests that we remand to the court of appeals for separate consideration of the Austin issue, such a remand is not necessary in this case. While future decisions of the court of appeals will define the outer boundaries of exceptional circumstances, we hold here that when a man with a history of assaultive behavior beats his particularly vulnerable wife almost to death, causing permanent brain damage, it is an "exceptional case.”