
561 N.W.2d 862 (1997)
221 Mich. App. 391
PEOPLE of the State of Michigan, Plaintiff-Appellee,
v.
Sharod Anthony HILL, Defendant-Appellant.
Docket No. 186869.
Court of Appeals of Michigan.
Submitted October 2, 1996, at Lansing.
Decided February 7, 1997, at 9:10 a.m.
Released for Publication April 29, 1997.
*863 Frank J. Kelley, Attorney General, Thomas L. Casey, Solicitor General, Arthur A. Busch, Prosecuting Attorney, Donald A. Kuebler, Chief, Appeals, Research, and Training, and Dale A. DeGarmo, Assistant Prosecuting Attorney, for People.
George C. Dovas, Westland, for defendant-appellant.
Before McDONALD, P.J., and BANDSTRA and C.L. BOSMAN[*], JJ.
BANDSTRA, Judge.
Defendant pleaded guilty of one count of first-degree home invasion, M.C.L. § 750.110a; M.S.A. § 28.305(a), and one count of assault with intent to rob while unarmed, M.C.L. § 750.88; M.S.A. § 28.283. He was initially sentenced to respective terms of twelve to twenty years' and eight to fifteen years' imprisonment. The sentences were originally ordered to run concurrently with each other and consecutively to a prior sentence that defendant was serving at the time of sentencing. Thereafter, the trial court modified its sentencing decision and ordered that defendant serve the sentences in this case consecutively, but that these sentences should be served concurrently with the prior sentence that defendant was already serving. Defendant now appeals as of right. We affirm defendant's sentence for the home invasion conviction, but vacate the sentence for the assault conviction and remand for resentencing.
Defendant argues that his original concurrent sentences were valid and that the trial court erred in amending the judgment of sentence and making the sentences consecutive. We disagree. A trial court's authority to resentence a defendant depends upon whether the original sentence was valid or invalid. MCR 6.429(A); In re Dana Jenkins, 438 Mich. 364, 368-369, 475 N.W.2d 279 (1991). Our Supreme Court has specifically reasoned that a sentence is invalid if the trial court "fails to exercise its discretion because it is laboring under a misconception of the law." Id. at 369, n. 3, 475 N.W.2d 279, quoting People v. Whalen, 412 Mich. 166, 170, 312 N.W.2d 638 (1981). In People v. Green, 205 Mich.App. 342, 345-346, 517 N.W.2d 782 (1994), this Court held that a sentence was invalid where the trial court sentenced the defendant under the mistaken belief that an enhanced sentence was mandatory rather than discretionary.
After sentencing, during argument concerning a defense motion for resentencing on other grounds, the prosecution argued to the court that it had sentenced defendant to concurrent terms under the erroneous belief that it had no discretion to make the sentences consecutive. The home invasion statute permits consecutive sentencing when another felony occurs during home invasion. M.C.L. § 750.110a(6); M.S.A. § 28.305(a)(6). The trial court explained that it had misinterpreted the notes made by the probation officer in the presentence investigation report regarding consecutive sentencing. The court was unaware of the statutory provision for consecutive sentencing, and the presentence investigation report did not make it clear that consecutive sentencing could apply to both of the offenses in this matter.
*864 The lower court record thus reveals that, initially, the trial court did not know that it had the discretion to sentence defendant to consecutive sentences because defendant had committed another crime while he was committing the home invasion offense. Accordingly, because the trial court originally sentenced defendant under a misconception of the law, it was entitled to modify defendant's sentences when the mistake was discovered. The trial court did not err in changing defendant's sentences to consecutive terms.[1]
Defendant asserts that the trial court erred in not preparing a sentencing information report pursuant to the sentencing guidelines for the assault conviction. The general instructions to the Michigan Sentencing Guidelines provide that "[i]n instances when there are multiple convictions for a single offender, the judge must complete the [SIR] for the conviction that carries the highest statutory maximum." Michigan Sentencing Guidelines (2d ed, 1988), p. 1. Quite understandably, the trial court concluded that the sentencing guidelines were thus inapplicable in this case because there are no guidelines for the crime of home invasion, which was the offense with the higher maximum statutory penalty. However, guidelines do exist for the offense of assault with intent to rob while unarmed, the other offense of which defendant was convicted.
The multiple conviction instruction requiring completion of an SIR pursuant to the sentencing guidelines only with respect to the crime carrying the highest statutory maximum penalty has been applied in concurrent sentencing cases. See, e.g., People v. Eberhardt, 205 Mich.App. 587, 590-591, 518 N.W.2d 511 (1994); People v. Hodges, 179 Mich.App. 629, 636, 446 N.W.2d 325 (1989). The question before us, apparently one of first impression, is whether this instruction should apply in consecutive sentencing cases such as that at issue here. We conclude that the instruction implicitly assumes that multiple sentences will be served concurrently and further conclude that this instruction should not be extended to consecutive sentencing situations. If sentences are to be served concurrently, there is no reason why a defendant's offenses should be scored separately because all of the defendant's sentences will be served at the same time. The sentence for the most severe offense will encompass the sentences for any lesser offenses. This is not true in cases involving consecutive sentencing. The minimum sentence imposed for each crime has a direct effect with respect to the total length of sentence a defendant must serve.
Further, when a trial court imposes consecutive sentences, the principle of proportionality requires that the sentences be separately evaluated by appellate courts. People v. Hardy, 212 Mich.App. 318, 320-321, 537 N.W.2d 267 (1995); People v. Hadley, 199 Mich.App. 96, 105-107, 501 N.W.2d 219 (1993), aff'd sub nom on other grounds People v. Morris, 450 Mich. 316, 537 N.W.2d 842 *865 (1995). While not necessarily dispositive of the proportionality question, the scoring of an offense under the sentencing guidelines presents a helpful starting point for review, and, accordingly, a trial court's preparation of an SIR for each of the offenses to which the consecutive sentencing applies would aid in this Court's review. We conclude that an SIR for the assault conviction offense should have been prepared pursuant to the guidelines' scoring, and defendant is entitled to be resentenced with respect to that conviction.[2]
Defendant next argues that his sentences for the home invasion and assault convictions are disproportionate. Defendant has waived any claim regarding the proportionality of his home invasion sentence by not arguing how his sentence for the offense is disproportionate. People v. Jones (On Rehearing), 201 Mich.App. 449, 456-457, 506 N.W.2d 542 (1993). In any event, we have reviewed the circumstances surrounding this offense and offender and conclude that the sentence for the home invasion conviction is not disproportionate. People v. Milbourn, 435 Mich. 630, 461 N.W.2d 1 (1990). In addition, because we are remanding for resentencing with regard to the assault conviction, we need not address defendant's proportionality argument with respect to the sentence for that conviction at this time.
Finally, defendant asserts that he should be resentenced before a different judge. We disagree. In determining whether resentencing should occur before a different judge, this Court applies the following test:
"(1) whether the original judge would reasonably be expected upon remand to have substantial difficulty in putting out of his or her mind previously-expressed views or findings determined to be erroneous or based on evidence that must be rejected, (2) whether reassignment is advisable to preserve the appearance of justice, and (3) whether reassignment would entail waste and duplication out of proportion to any gain in preserving the appearance of fairness." [People v. Evans, 156 Mich.App. 68, 72, 401 N.W.2d 312 (1986), quoting United States v. Sears, Roebuck & Co., Inc., 785 F.2d 777, 780 (C.A.9, 1986).]
In this case, the trial court's errors involved questions of law, i.e., whether defendant's assault conviction should have been scored pursuant to the sentencing guidelines and whether consecutive sentencing was available. There is no indication, as defendant asserts, that the original trial judge would have substantial difficulty in setting aside his previously expressed views. Thus, resentencing before a different judge is not required.
We affirm defendant's sentence for the home invasion conviction, but vacate the sentence for the assault conviction and remand for a completion of an SIR pursuant to the sentencing guidelines for this offense and resentencing for this offense. We do not retain jurisdiction.
NOTES
[*]  Circuit judge, sitting on the Court of Appeals by assignment.
[1]  We note that a panel of this Court concluded in People v. Pfeiffer, 207 Mich.App. 151, 157, 523 N.W.2d 640 (1994), that only a defendant and not the prosecution is entitled by MCR 6.429(A) to challenge a sentence as invalid. While that rationale might otherwise be controlling and require a different result than we have reached, we find Pfeiffer to be inapposite because the panel there did not have before it a sentence that resulted from the trial court's failure to exercise its discretion under a misconception of the law. As noted earlier, our Supreme Court has specifically held that a sentence resulting from a failure to exercise discretion as a result of a mistake about the law is invalid. Jenkins, supra at 369, n. 3, 475 N.W.2d 279. Further, in the instant case, M.C.L. § 750.110a(6); M.S.A. § 28.305(a)(6) implicitly grants the prosecutor the right to ask the trial court to use its discretion to impose a consecutive sentence and would provide a basis for appeal by a prosecutor under an abuse of discretion standard if a consecutive sentence was not imposed. In contrast, the prosecutor in Pfeiffer complained that certain procedural requirements of the Crime Victim's Rights Act had not been observed during the sentencing process, but our Court reasoned that the act does not confer on prosecutors any right to complain if provisions of the act designed to protect victims are not followed. Pfeiffer, supra at 157, 523 N.W.2d 640. While we do not consider Pfeiffer to be controlling upon us for these reasons, we further question whether Pfeiffer, supra at 157, 523 N.W.2d 640, correctly concluded that only a defendant can contest a sentence as invalid on the basis of the Staff Note following MCR 6.429. That Staff Note seems to directly contradict MCR 6.429(A) itself, as well as our Supreme Court's direction in Jenkins, supra, neither of which contains any suggestion that prosecutors are prohibited from challenging a sentence as invalid.
[2]  Although defendant suggests in his appellate brief that the trial court should have scored his home invasion conviction by using the guidelines for breaking and entering, we find this argument to be abandoned because defendant has failed to cite any authority to support his position. Shanafelt v. Allstate Ins. Co., 217 Mich.App. 625, 643, 552 N.W.2d 671 (1996). Further, not all crimes are included in the guidelines, as is the case with the home invasion offense, and the guidelines are inapplicable to those offenses. Michigan Sentencing Guidelines (2d ed, 1988), p 1; People v. Douglas (On Remand), 191 Mich. App. 660, 663, 478 N.W.2d 737 (1991).
