OPINION
STEWART, Judge.Lottie R. Beasley, a first felony offender, pleaded no contest to third-degree assault, a class C felony.1 The superior court found that several statutory aggravating factors from AS 12.55.155(c) applied by analogy 2 and imposed a 3 1/2 year term with 1 year suspended, a sentence in excess of the Austin limit.3 Beasley argues that AS 12.55.125(k) bars the superior court from imposing a sentence of imprisonment, whether suspended or unsuspended, that exceeds the presumptive sentence for a third felony offender4 We reject Beasley's interpretation of the statute and conclude that AS 12.55.125(k) contains no such restriction. Therefore, we affirm Beasley's sentence.
On June 1, 2001, the Alaska State Troopers were contacted because two of Beasley's boys, G.B. and KD., ran away from home and complained to a neighbor that Beasley was assaulting them. 'The boys' complaints led to an investigation by the Troopers that culminated in a grand jury indictment. The grand jury charged Beasley with one count of second-degree assault, and seven counts of third-degree assault. The State also filed an information charging Beasley with six counts of fourth-degree assault. These allegations charged Beasley with assaulting the two boys who ran away and H.G., another sibling. Ultimately, the State filed an information supplanting the indictment and the first information. This information charged Beasley with one consolidated count of third-degree assault against all three victims occurring over the course of three months. Beasley pleaded no contest to this consolidated count.
*1084Superior Court Judge Mary E. Greene found that several aggravating factors from AS 12.55.155(c) applied by analogy to Beasley's sentencing:5 (c)(5) (Beasley knew or reasonably should have known that her victims were particularly vulnerable); (c)(9) (Beasley knew that her offense involved more than one victim); (c)(10) (Beasley's conduct was among the most serious within the definition of the offense); (c)(18)(A) (Beasley and her victims were living together in one social unit); and (c)(18)(C) (Beasley's assault was a domestic violence assault committed in the presence of a child under 16 who was living in the residence where the crime occurred). Judge Greene imposed 3 1/2 years' imprisonment with 1 year suspended.
Beasley claims that under AS 12.55.125(k) her sentence is illegal. Beasley argues that under this statute, the superior court could impose no more than a 3-year term whether the term is suspended in whole or in part. This claim presents a question of statutory interpretation.
"The guiding principle of statutory construction is to ascertain and implement the intent of the legislature or agency that promulgated the statute or regulation."6 Alaska courts apply a sliding seale approach to statutory interpretation: to determine the meaning of a statute we look to its legislative history, even if its language is plain on its face.7 But "the plainer the meaning of the language of the statute, the more convincing any contrary legislative history must be."8 When a statute's meaning appears clear and unambiguous, the party urging another meaning "bears a correspondingly heavy burden of demonstrating contrary legislative intent.9
AS 12.55.125(k) was first enacted by chapter 79, § 25, SLA 1992. The genesis of this law was 1992 House Bill 396. In part, this bill was a response to this court's decision in Buoy v. State.10 In Buoy, we held that before a sentencing judge can exceed the Austin limit, the State must prove statutory aggravating factors by clear and convincing evidence.11 In hearings before the House Judiciary Committee, representatives from both the Department of Law and the Department of Public Safety told the committee that the intent of the bill was to overturn Buoy and require that aggravating factors be proved by a preponderance of the evidence.12
But the House Judiciary Committee amended the bill and proposed the enactment of a new subsection to AS 12.55.125, subsection (k), that provided:
(k) A first felony offender convicted of an offense for which a presumptive term of imprisonment is not specified under this section may not be sentenced to a term of unsuspended imprisonment that exceeds the presumptive term for a second felony offender convicted of the same crime unless the court finds by clear and convincing evidence that an aggravating factor under AS 12.55.155(c) is present, or that cireum-stances exist that would warrant a referral to the three-judge panel under AS 12.55.165.
Thus, in its amended form, Committee Substitute for HB 396(Jud), the bill expressly adopted the Buoy decision.
The Senate Judiciary Committee later amended and re-organized CSHB 896. The final version of the bill, Senate Committee Substitute for CSHB 396, preserved the House Judiciary Committee's amendment adopting subsection (k). This section passed *1085the legislature as chapter 79, § 25, SLA 1992.
AS 12.55.125(k) was amended in 1999. The source of the amendment was 1999 Senate Bill 3. The entire bill as proposed enacted several changes to increase penalties for the homicide of a child.13 The final form of the bill was contained in the House Committee Substitute for CSSB 3(FIN). In a hearing before the House Finance Committee, a staff member of the bill's prime sponsor, Senator Halford, provided a sectional analysis of the bill and testified that the section of the bill amending AS 12.55.125(k) allowed a sentencing court to sentence an offender convicted of criminally negligent homicide of a child under 16 to a longer sentence than the presumptive sentence for a second or third felony offender convicted of the same crime.14 The bill passed and the section amending AS 12.55.125(k) into its present form was included as chapter 54, § 11, SLA 1999.
AS 12.55.125(k) now provides:
(k) A first felony offender convicted of an offense for which a presumptive term of imprisonment is not specified under this section
(1) may be sentenced to a term of un-suspended imprisonment that exceeds the presumptive term for a second or third felony offender convicted of the same crime if the offender is convicted of erimi-nally negligent homicide and the victim is a child under the age of 16;
(2) except as provided in (1) of this subsection, may not be sentenced to a term of unsuspended imprisonment that exceeds the presumptive term for a second felony offender convicted of the same crime unless the court finds by clear and convincing evidence that an aggravating factor under AS 12.55.155(c) is present, or that circumstances exist that would warrant a referral to the three-judge panel under AS 12.55.165.
Beasley argues that when subsections (1) and (2) are read together, one must conclude that the only cireumstance when a court sentencing a first felony offender is authorized to exceed the presumptive term for a third felony offender is contained in (k)(1). Beasley claims that sole circumstance occurs when a court is sentencing an offender for the eriminally negligent homicide of a child under 16. But on its face, subsection (k)(ZQ) contains the general rule that requires a sentencing judge to find a statutory aggravating factor or an extraordinary circumstance warranting a referral to a three-judge sentencing panel before exceeding the presumptive term for a second felony offender. The 1999 amendment did not alter this general rule and the legislative history of the 1999 amendment does not contain an indication that the legislature intended to further limit the authority of a sentencing judge in the normal case. Subsection (k)(1) enacted an exception to this general rule for the erimi-nally negligent homicide of a child under 16 by authorizing a court sentencing a first felony offender convicted of this erime to exceed the presumptive term for a second or a third felony offender without requiring the sentencing judge to find a statutory aggravating factor or extraordinary cireumstances.
As the proponent of an interpretation different than what appears on the face of the statute, Beasley "bears a correspondingly heavy burden of demonstrating contrary legislative intent." 15 But Beasley has not pointed to any legislative history showing that the purpose of the amendment to subsection (k) that was contained in chapter 54, § 11, SLA 1999 was to cap the sentencing range for a first felony offender at the presumptive term for a third felony offender. Instead, the overall underlying purpose of S.B. 3 appears to be the establishment and authorization of greater penalties for the homicide of children *1086under the age of 16.16
When sentencing a first felony offender in the normal case, subsection (k) does require a sentencing judge to find statutory aggravating factors or extraordinary circumstances before imposing an unsuspended term of imprisonment exceeding the presumptive term for a second felony offender. But we conclude that subsection (k) does not constrain a sentencing judge to impose less than the presumptive term for a third felony offender when the judge finds that the State has proven that a statutory aggravating factor or factors apply.
Beasley's sentence is AFFIRMED.
. AS 11.41.220(a), (b).
. See Wylie v. State, 797 P.2d 651, 663 (Alaska App.1990).
. See Austin v. State, 627 P.2d 657, 657-58 (Alaska App.1981) (A first felony offender should ordinarily receive a more favorable sentence than the presumptive term for a second felony offender convicted of the same class of crime).
. AS 12.55.125(e)(2).
. See Wylie v. State, 797 P.2d 651, 663 (Alaska App.1990).
. Millman v. State, 841 P.2d 190, 194 (Alaska App.1992).
. See Progressive Ins. Co. v. Simmons, 953 P.2d 510, 516 (Alaska 1998).
. Id. (citing State v. Alex, 646 P.2d 203, 208-09 n. 4 (Alaska 1982)).
. University of Alaska v. Geistauts, 666 P.2d 424, 428 n. 5 (Alaska 1983).
. 818 P.2d 1165 (Alaska App.1991).
. Id. at 1167-68.
. See House Judiciary Committee hearing on H.B. 396 (January 17, 1992) (testimony by Gayle Horetski, Deputy Commissioner of Public Safety); (January 24, 1992) (testimony of Margot Knuth, Assistant Attorney General).
. See House Judiciary Committee hearing on S.B. 3 (March 3, 1999) (testimony by Juli Lucky, Staff, Senator Rick Halford).
. See House Finance Committee hearing on S.B. 3 (May 10, 1999) (testimony by Juli Lucky, Staff, Senator Rick Halford).
. University of Alaska v. Geistauts, 666 P.2d 424, 428 n. 5 (Alaska 1983).
. See House Judiciary Committee hearing on S.B. 3 (March 3, 1999) (testimony by Juli Lucky, Staff, Senator Rick Halford (The purpose of the prime sponsor of the bill, Senator Halford, is to send the message "if you kill a child you will go to jail for a long time.").