OPINION OF THE COURT

In this case, Appellant William Karaffa appeals from the order of the Superior Court affirming Appellant’s judgment of sentence entered in the Court of Common Pleas of Butler County. For the reasons outlined below, we reverse and remand for a new trial.

On December 23, 1992, Karaffa was charged with a number of offenses, including two counts of rape, two counts of conspiracy to commit rape, indecent assault, making false reports, indecent exposure, involuntary deviate sexual intercourse and *175unlawful restraint.1 At trial, the victim testified that she was raped by Karaffa and that Karaffa’s co-defendant, Tina Gately, forced oral intercourse upon her at a motel where Karaffa and Gately were staying. Following a verbal charge to the jury, the trial court, without objection by Karaffa’s trial counsel, allowed the jurors to deliberate with a written instruction on the elements of unlawful restraint as well as a written definition of reasonable doubt. On March 23, 1994, the jury convicted Karaffa of two counts of rape, indecent assault, making false reports, indecent exposure and conspiracy to commit rape. The court then sentenced Karaffa to a term of imprisonment of a minimum of ten to a maximum of twenty years and subsequently denied post-sentence motions filed by Karaffa.

On appeal, Karaffa raised multiple issues, including the allegation that the trial court had erred by submitting written instructions to the jury while it deliberated and that trial counsel was ineffective for failing to object to this submission. Although the Superior Court found that it was error for the trial court to give the jury written instructions, it nonetheless concluded that such error was harmless. The Superior Court rejected Karaffa’s remaining claims and affirmed his judgment of sentence. We granted allocatur to determine whether the Superior Court erred in finding the submission of written instructions to the jury to be harmless error and whether trial counsel was ineffective for failing to object to the trial court’s actions.2 Since we agree with Karaffa that our decision in *176Commonwealth v. Oleynik, 524 Pa. 41, 568 A.2d 1238 (1990), controls and therefore, reversible rather than harmless error was committed by the trial court, we reverse. In so doing, we re-emphasize this Court’s holding and rationale in Oleynik, so that it is clear that the submission of written jury instructions constitutes reversible error in this Commonwealth.

In Oleynik, this Court found that the submission of written instructions to the jury during deliberations was unfairly prejudicial and granted a new trial on that basis. Prior to Oleynik, this Court had consistently articulated a strong preference for issuing oral, rather than written, instructions to the jury. In 1976, this Court first addressed the issue of submitting written instructions to the jury in Commonwealth v. Baker, 466 Pa. 382, 353 A.2d 406 (1976) (plurality opinion). In Baker, the trial court had relied on Pa.R.Crim.P. 1114 in determining that sending written questions with possible verdicts to the jury would be beneficial to its deliberations and therefore proper.3 Id. at 397, 353 A.2d at 413. Noting that Pa.R.Crim.P. 1114 did not specifically prohibit this practice, a plurality of this Court therefore held that the trial court had not abused its discretion in submitting these written instructions to the jury. Id. at 397, 353 A.2d at 414. Significantly, however, this Court also recognized the “inherent dangers” in using written instructions and therefore cautioned that “in the future this practice should not be followed.”4 Id. at 397-98, 353 A.2d at 414.

*177While the preference disfavoring written jury instructions continued to be expressed by this Court after Baker, any alleged error resulting from the submission of written instructions was examined for an abuse of discretion by the trial court and in light of possible prejudice to the defendant. See Commonwealth v. Morales, 508 Pa. 51, 494 A.2d 367 (1985) (holding that there was neither abuse of discretion nor possibility of prejudice to appellant from the court’s use of a written list of aggravating and mitigating circumstances); Commonwealth v. Kelly, 484 Pa. 527, 399 A.2d 1061 (1979) (holding that the trial court did not abuse its discretion and that appellant suffered no prejudice by the submission of written notations on the verdict slip to the jury). See also Commonwealth v. Todaro, 549 Pa. 545, 701 A.2d 1343 (1997) (noting proposition that cases predating Oleynik examined the submission of written instructions for abuse of discretion and prejudice to the defendant). A stricter, if not bright-line, approach to evaluating the use of written jury instructions for error was not adopted until this Court’s decision in Oleynik.

In Oleynik, this Court specifically held that the possible prejudice to a defendant from providing written instructions to a jury universally outweighs any benefit such instructions might provide. Oleynik, 524 Pa. at 46, 568 A.2d at 1241. This holding stemmed from the recognition “that a jury would [likely] assess undue weight to the points of law in written instructions and possibly misinterpret or misapply the law” and that this “undue emphasis on portions of the charge has the potential of undermining the integrity of the deliberative process.” Id. at 46-47, 568 A.2d at 1241. Accordingly, the Oleynik Court concluded that the submission of written jury instructions at Oleynik’s trial constituted reversible error. Id.

While the Superior Court in the instant case agreed that the trial court’s use of written jury instructions constituted error, the court nonetheless departed from Oleynik and found such error to be harmless. In reaching this conclusion, however, *178the Superior Court examined the issue under the mistaken belief that the jury had been allowed to deliberate only with a written definition of unlawful restraint. Under this premise, the Superior Court found that since the jury had not convicted Karaffa of unlawful restraint, the trial court’s érror had been harmless. Notwithstanding the Superior Court’s oversight of the jury’s use of written instructions also defining reasonable doubt, we find that the Superior Court erred in employing a harmless error analysis.

In light of Oleynik’s discussion on the potential adverse influence of written instructions on a jury’s deliberative process, the very process that leads to its verdict, it would be logically unsound to conclude beyond a reasonable doubt that there was not a reasonable possibility that the instructions received by the jury contributed to its verdict. See Commonwealth v. Story, 476 Pa. 391, 383 A.2d 155 (1978) (holding that error can only be deemed harmless if appellate court is convinced beyond a reasonable doubt that error was harmless and error cannot be deemed harmless whenever there is a reasonable possibility that error might have contributed to the verdict). Indeed, the Superior Court, contrary to its conclusion in the instant case, has previously held that a trial court’s submission of written instructions to the jury was reversible error. Commonwealth v. Byrd, 409 Pa.Super. 611, 616, 598 A.2d 1011, 1014 (1991). In Commonwealth v. Byrd, the Superior Court specifically relied on Oleynik’s holding regarding the blanket prejudicial effect of written instructions in reaching its conclusion that reversible, and not harmless, error had occurred from the trial court’s use of this device. Id. at 616, 598 A.2d at 1014.5

*179In support of its argument that the use of written instructions in the instant case amounted only to harmless error, the Commonwealth adopts the reasoning of the Superior Court and argues that because no prejudice occurred to Karaffa from the jury’s use of partial written instructions, Oleynik does not mandate a reversal. The Commonwealth’s argument, however, misconstrues the fundamental principle of Oleynik that the use of written jury instructions is intrinsically prejudicial and it is this intrinsic, unfair prejudice that requires granting a new trial. Contrary to both the Commonwealth’s assertions and the Superior Court’s determination below, then, Oleynik discloses what today’s holding strives to make clear — it is reversible error for a trial court to send written instructions to a jury during its deliberations.

Finally, the Superior Court found that trial counsel was not ineffective for failing to object to the use of written instructions because Karaffa had failed to demonstrate how the trial counsel’s inaction prejudiced him.6 We disagree. The three prong test under which claims of ineffective assistance of counsel are to be reviewed when presented on direct appeal is well settled. To prevail on such a claim, Appellant must demonstrate (1) that the underlying claim is of arguable merit; (2) that counsel’s course of conduct was without a reasonable basis designed to effectuate his client’s interest; and (3) that he was prejudiced by counsel’s ineffectiveness. See Commonwealth v. Howard, 538 Pa. 86, 93, 645 A.2d 1300, 1304 (1994). Considering Oleynik’s directive that it is improper for a trial court to submit written instructions to a jury given the inherent prejudice in this practice, this Court has little difficulty in determining that counsel was ineffective for failing to object to the use of written instructions under this three prong standard and specifically, that Karaffa was prejudiced by trial counsel’s omission.

*180Accordingly, the order of the Superior Court is reversed and the matter is remanded for a new trial. Jurisdiction relinquished.

dissenting.

I respectfully dissent to the majority’s conclusion that it was reversible error for the trial court to submit written instructions to the jury in this case. I believe that Commonwealth v. Oleynik, 524 Pa. 41, 568 A.2d 1238 (1990) was wrongly decided, and that trial courts should have discretion to submit standard written instructions to juries in appropriate circumstances.

The holding of Oleynik and the majority’s position in the instant matter increase the risk, particularly in long and complicated trials, that the jury will be unable to properly apply the law to the facts of the case because it is unable to understand or remember the legal principles enunciated in the oral charge. Jury instructions have become so complex and laden with legalese that they are virtually incomprehensible at times to the average juror. Unless it requests repetition by the court, the jury hears the often obscurely worded instructions once. The jury receives no further legal guidance during its arduous journey towards reaching a verdict. I believe that permitting trial judges to submit written jury instructions could improve jury comprehension and the reliability of verdicts.

Written instructions are highly appropriate to assist jurors who do not understand or accurately recall the trial judge’s instructions after the initial oral presentation by the judge. The majority’s position fails to recognize that jurors do not have perfect memories. There is an invariable risk that jurors will not remember or comprehend the quantity of complex information necessary to make informed and well-reasoned verdicts without the use of some form of written aid. “One of the greatest fictions known to the law is that a jury of *181twelve laymen can hear a judge read a set of instructions once, then understand them, digest them, and correctly apply them to the facts in the case. It has taken the judge and the lawyers years of study to understand the law as stated in those instructions.” Susan R. Schwaiger, The Submission of Written Instructions and Statutory Language to New York Criminal Juries, 56 Brooklyn L.Rev. 1358, 1360 (1991) (quoting Judge Frank Swain, Common Sense in Jury Trials, 30 Cal. St. B.J. 405, 412 (1955)).

At common law, the submission of written materials to the jury was prohibited because of the concern that literate jurors would have unfair influence over nonliterate jurors, thereby prejudicing the verdict. See Robert G. Nieland, Pattern Jury Instructions: A Critical Look at a Modem Movement to Improve the Jury System, 29-30 (1979). Literacy is no longer a primary concern, and modern trials have made exclusive reliance on oral presentation impractical. Further, differences in education and social status always affect the relative roles of jurors, and better-educated jurors are likely to be influential even if the instructions are given orally. It is possible that a juror with a stronger vocabulary would glean more from the oral instruction and become the legal expert of the jury, dominating the deliberation. By contrast, if the jury is provided written instructions in addition to oral instructions, a juror who did not capture a crucial legal concept during the oral presentation can reread the instruction. With oral instructions, a confused juror must either rely on the memory of a fellow juror or persuade the entire jury to approach the court for re-instruction. In Oleynik, this Court adhered to the common law tradition in the face of overwhelming evidence that the concerns that gave rise to that tradition are now obsolete and that a modern set of concerns militate heavily against it.

In Oleynik, this Court suggested that written instructions were likely to mislead the jurors because they would tend to read only part of the instructions, and would attempt to construe the writing on their own rather than returning to the court for further instruction if they had questions. The *182majority today espouses that written instructions increase the risk that the jury will misinterpret and misapply the law. I believe that these positions are not grounded in sound logic. Realistically, even in straightforward cases, lay jurors will capture only an approximation of the rules of law when those rules are communicated in a single oral presentation. Jurors may misapply the law regardless of whether the instructions are oral or written. It is far more likely that jurors will misunderstand and misapply a complex set of rules told to them one time, than if they have the rules with them during deliberations. Further, jurors’ difficulty with oral instructions has been well documented.1

The United States Supreme Court has approved the practice of submitting a written jury charge. Haupt v. United States, 330 U.S. 631, 643, 67 S.Ct. 874, 879-80, 91 L.Ed. 1145 (1947) (allowing the jury to have a typewritten copy of the court’s charge does not warrant the inference of unfairness or irregularity in the trial). The federal courts and approximately thirty states favor the submission of a written charge. Propriety and Prejudicial Effect of Sending Written Instructions With Retiring Jury In Criminal Cases, 91 A.L.R.3d 382 *183(1979).2 Besides Pennsylvania, Indiana is the only state to prohibit the use of written instructions. Id.; see Sanders v. Indiana, 264 Ind. 688, 348 N.E.2d 642, 644 (1976). I agree with the majority of courts which have held that the use of written instructions is permissible. Written instructions would help keep the jury focused on the law applicable to the case, thereby benefitting all parties.

Further, I agree with the Superior Court’s conclusion in this matter that the submission of written instructions to the jury constituted harmless error. The trial court gave the jury written instructions on the definition of reasonable doubt and unlawful restraint. Appellant was acquitted of unlawful restraint. Therefore, there was no prejudice as to the unlawful restraint instruction. Additionally, appellant was acquitted of five other charges. In order to convict appellant of six charges and acquit him of five in the consistent manner in which it did,3 the jury must have understood the concept of reasonable doubt. Accordingly, the issuance of written instructions to the jury did not constitute reversible error as the majority concludes.

For the aforementioned reasons, I dissent.