Berdon, J.
In this product liability claim brought pursuant to the Product Liability Act (act); General Statutes § 52-572m et seq.; the dispositive issue is whether the defendant product seller was entitled to a jury instruction on the defense of alteration or modification predicated on misuse under General Statutes § 52-572p, in addition to an instruction on misuse under the common law.
[502]*502The plaintiff Steven Elliot1 brought this action for damages as a result of injuries he received in a fall from a ladder sold by the defendant, Sears, Roebuck and Company. The jury, in finding the issue of liability in favor of the plaintiff, also found that the damages sustained by the plaintiff totaled $136,050, and that those damages were to be reduced by 25 percent as a result of the plaintiffs comparative responsibility. The trial court accordingly reduced the plaintiffs award, and rendered judgment for the plaintiff in the amount of $102,037.50. After the trial court denied the defendant’s motion to set aside the verdict,2 the defendant appealed to the Appellate Court. The Appellate Court affirmed the trial court’s judgment; Elliot v. Sears, Roebuck & Co., 30 Conn. App. 664, 621 A.2d 1371 (1993); and we granted the defendant’s petition for certification.3 Although we affirm the judgment of the Appellate Court, we base our decision on an analysis of the statutory language not relied upon by that court.
[503]*503The jury could reasonably have found the following facts. In April, 1987, the plaintiff and his wife, with the assistance of a contractor, were adding a full second floor to their A-frame house in Waterford. As a means of access to the new floor under construction, they borrowed a sixteen foot aluminum extension ladder, constructed with rounded rungs, belonging to the plaintiffs father-in-law. The ladder had been purchased from the defendant in 1985.
The plaintiff set up the ladder in the following manner. The base of the ladder was secured against a board that was nailed into the floor framing. The “fly” of the ladder, the moving part which extends its length, was extended one or two feet and tied to a two-by-four affixed to a partition on the second floor. The plaintiff set up the ladder in this manner so that it would not move or slip during use. The ladder was set at approximately a sixty degree angle, so that it would function as a staircase. At the top of the fly of the ladder, there was a sharp metal edge that was exposed when the ladder was extended. The plaintiff had not noticed this exposed edge prior to his injury.
The plaintiff often descended the ladder with his back to the rungs. A label on the ladder warned users “always [to] face ladder when climbing, working or descending.” The label also contained the warning that users should always maintain a firm grip on the ladder. The plaintiff had not read any of the labels on the ladder prior to his accident.
On April 17, 1987, the plaintiff was visited by a friend. They each climbed the ladder to the second floor so the plaintiff could show him the progress made on the addition. After fifteen to twenty minutes, the telephone, which was located in the kitchen on the first floor, rang. In order to answer the telephone, the plaintiff descended the ladder, with his back to it, and about [504]*504half way down he lost his balance and slipped.4 As he fell, he reached out with his left hand to grab something to steady himself. He was wearing his wedding ring on his left hand ring finger. As he attempted to break his fall, the ring snagged on the exposed sharp metal edge at the top of the extension ladder. This caused the plaintiff to suffer a degloving injury to the finger, leaving him with an exposed bone and tendon without any skin or soft tissue. His finger was eventually amputated.
Eric Jordan, an associate professor of mechanical engineering at the University of Connecticut, testified as an expert witness for the plaintiff. Jordan testified that it is generally recognized that metal ladders should include end caps and end closures or equivalent protection against sharp edges and snagging. He testified that although the ladder did include end caps, there was an exposed sharp upper edge of the ladder that was not capped. In his opinion, this presented a significant hazard of snagging, and therefore the end caps included with the ladder did not “fulfill the intended purpose of the end cap with regards to preventing snagging and sharp edge injury.” In Jordan’s opinion, the ladder was unreasonably dangerous due to the defectively designed end caps. Jordan also testified that the top of the ladder could have been fully capped without impairing the function of the ladder and without incurring a significant cost. Finally, he testified that although it is a misuse of the ladder to descend with one’s back to the ladder, it is a common and foreseeable misuse that could reasonably be anticipated by the seller.
In adopting the act, the legislature intended to incorporate in a single cause of action an exclusive remedy for all claims falling within its scope. Winslow v. Lewis-[505]*505Shepard, Inc., 212 Conn. 462, 471, 562 A.2d 517 (1989). In doing so, “the legislature was merely recasting an existing cause of action and was not creating a wholly new right for claimants harmed by a product. The intent of the legislature was to eliminate the complex pleading provided at common law. . . . 22 S. Proc., Pt. 14, 1979 Sess., pp. 4637-38; 22 H.R. Proc., Pt. 20, 1979 Sess., pp. 7021-22.” Lynn v. Haybuster Mfg., Inc., 226 Conn. 282, 292, 627 A.2d 1288 (1993). The act, however, is no model of clarity; an example is its ambiguous treatment of the defense of misuse that has resulted in this appeal.
One point of confusion regarding the act, as demonstrated by the briefs of the parties before us and by members of the bar,5 is the belief that it was patterned after the Model Uniform Product Liability Act (model act), 44 Fed. Reg. 62714-50 (1979), recommended by the United States Department of Commerce on October 31, 1979. As we have previously stated, however, the act is based on the Draft Uniform Product Liability Law (draft act), published by the Department of Commerce on January 12, 1979, in 44 Fed. Reg. 2996 et seq. for public comment. See Freeman v. Alamo Management Co., 221 Conn. 674, 681 n.7, 607 A.2d 370 (1992); Winslow v. Lewis-Shephard, Inc., supra, 212 Conn. 469. This origin of our act is indicated by the date of its adoption,6 its language,7 and its legislative [506]*506history.8 There are substantial differences between the model act and the draft act. This is particularly so in regard to § 112 of the model act, upon which the defendant relies, as indicated below in this opinion.
The defendant, in addition to denying liability, raised two special defenses that are relevant to this appeal.
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Berdon, J.
In this product liability claim brought pursuant to the Product Liability Act (act); General Statutes § 52-572m et seq.; the dispositive issue is whether the defendant product seller was entitled to a jury instruction on the defense of alteration or modification predicated on misuse under General Statutes § 52-572p, in addition to an instruction on misuse under the common law.
[502]*502The plaintiff Steven Elliot1 brought this action for damages as a result of injuries he received in a fall from a ladder sold by the defendant, Sears, Roebuck and Company. The jury, in finding the issue of liability in favor of the plaintiff, also found that the damages sustained by the plaintiff totaled $136,050, and that those damages were to be reduced by 25 percent as a result of the plaintiffs comparative responsibility. The trial court accordingly reduced the plaintiffs award, and rendered judgment for the plaintiff in the amount of $102,037.50. After the trial court denied the defendant’s motion to set aside the verdict,2 the defendant appealed to the Appellate Court. The Appellate Court affirmed the trial court’s judgment; Elliot v. Sears, Roebuck & Co., 30 Conn. App. 664, 621 A.2d 1371 (1993); and we granted the defendant’s petition for certification.3 Although we affirm the judgment of the Appellate Court, we base our decision on an analysis of the statutory language not relied upon by that court.
[503]*503The jury could reasonably have found the following facts. In April, 1987, the plaintiff and his wife, with the assistance of a contractor, were adding a full second floor to their A-frame house in Waterford. As a means of access to the new floor under construction, they borrowed a sixteen foot aluminum extension ladder, constructed with rounded rungs, belonging to the plaintiffs father-in-law. The ladder had been purchased from the defendant in 1985.
The plaintiff set up the ladder in the following manner. The base of the ladder was secured against a board that was nailed into the floor framing. The “fly” of the ladder, the moving part which extends its length, was extended one or two feet and tied to a two-by-four affixed to a partition on the second floor. The plaintiff set up the ladder in this manner so that it would not move or slip during use. The ladder was set at approximately a sixty degree angle, so that it would function as a staircase. At the top of the fly of the ladder, there was a sharp metal edge that was exposed when the ladder was extended. The plaintiff had not noticed this exposed edge prior to his injury.
The plaintiff often descended the ladder with his back to the rungs. A label on the ladder warned users “always [to] face ladder when climbing, working or descending.” The label also contained the warning that users should always maintain a firm grip on the ladder. The plaintiff had not read any of the labels on the ladder prior to his accident.
On April 17, 1987, the plaintiff was visited by a friend. They each climbed the ladder to the second floor so the plaintiff could show him the progress made on the addition. After fifteen to twenty minutes, the telephone, which was located in the kitchen on the first floor, rang. In order to answer the telephone, the plaintiff descended the ladder, with his back to it, and about [504]*504half way down he lost his balance and slipped.4 As he fell, he reached out with his left hand to grab something to steady himself. He was wearing his wedding ring on his left hand ring finger. As he attempted to break his fall, the ring snagged on the exposed sharp metal edge at the top of the extension ladder. This caused the plaintiff to suffer a degloving injury to the finger, leaving him with an exposed bone and tendon without any skin or soft tissue. His finger was eventually amputated.
Eric Jordan, an associate professor of mechanical engineering at the University of Connecticut, testified as an expert witness for the plaintiff. Jordan testified that it is generally recognized that metal ladders should include end caps and end closures or equivalent protection against sharp edges and snagging. He testified that although the ladder did include end caps, there was an exposed sharp upper edge of the ladder that was not capped. In his opinion, this presented a significant hazard of snagging, and therefore the end caps included with the ladder did not “fulfill the intended purpose of the end cap with regards to preventing snagging and sharp edge injury.” In Jordan’s opinion, the ladder was unreasonably dangerous due to the defectively designed end caps. Jordan also testified that the top of the ladder could have been fully capped without impairing the function of the ladder and without incurring a significant cost. Finally, he testified that although it is a misuse of the ladder to descend with one’s back to the ladder, it is a common and foreseeable misuse that could reasonably be anticipated by the seller.
In adopting the act, the legislature intended to incorporate in a single cause of action an exclusive remedy for all claims falling within its scope. Winslow v. Lewis-[505]*505Shepard, Inc., 212 Conn. 462, 471, 562 A.2d 517 (1989). In doing so, “the legislature was merely recasting an existing cause of action and was not creating a wholly new right for claimants harmed by a product. The intent of the legislature was to eliminate the complex pleading provided at common law. . . . 22 S. Proc., Pt. 14, 1979 Sess., pp. 4637-38; 22 H.R. Proc., Pt. 20, 1979 Sess., pp. 7021-22.” Lynn v. Haybuster Mfg., Inc., 226 Conn. 282, 292, 627 A.2d 1288 (1993). The act, however, is no model of clarity; an example is its ambiguous treatment of the defense of misuse that has resulted in this appeal.
One point of confusion regarding the act, as demonstrated by the briefs of the parties before us and by members of the bar,5 is the belief that it was patterned after the Model Uniform Product Liability Act (model act), 44 Fed. Reg. 62714-50 (1979), recommended by the United States Department of Commerce on October 31, 1979. As we have previously stated, however, the act is based on the Draft Uniform Product Liability Law (draft act), published by the Department of Commerce on January 12, 1979, in 44 Fed. Reg. 2996 et seq. for public comment. See Freeman v. Alamo Management Co., 221 Conn. 674, 681 n.7, 607 A.2d 370 (1992); Winslow v. Lewis-Shephard, Inc., supra, 212 Conn. 469. This origin of our act is indicated by the date of its adoption,6 its language,7 and its legislative [506]*506history.8 There are substantial differences between the model act and the draft act. This is particularly so in regard to § 112 of the model act, upon which the defendant relies, as indicated below in this opinion.
The defendant, in addition to denying liability, raised two special defenses that are relevant to this appeal. In the first special defense, upon which the trial court instructed the jury, it alleged misuse of the product under the common law. The defendant based this claim on its allegations that the plaintiff descended the ladder as though it were a staircase, facing away from the ladder, and failed to read and follow the instructions and warnings concerning the use of the ladder. In the second special defense, predicated upon General Statutes § 52-572p, the defendant alleged that the “ladder was altered or modified by the plaintiffs or a third-party from the condition in which it was sold.” The trial court refused to instruct the jury on the second special defense,9 but did instruct on the first. The defendant claims that, although the trial court satisfactorily instructed the jury on the common law defense of misuse, it was also entitled to an instruction on the second special defense predicated on statutory altera[507]*507tion/modification by misuse under § 52-572p. Section 52-572p provides in pertinent part: “(a) A product seller shall not be liable for harm that would not have occurred but for the fact that his product was altered or modified by a third party unless: (1) The alteration or modification was in accordance with the instructions or specifications of the product seller; (2) the alteration or modification was made with the consent of the product seller; or (3) the alteration or modification was the result of conduct that reasonably should have been anticipated by the product seller, (b) For the purposes of this section, alteration or modification includes changes in the design, formula, function or use of the product from that originally designed, tested or intended by the product seller.” (Emphasis added.)
The defendant argues that the defense of misuse under the common law and the defense of alteration/modification by “changes in the . . . use of the product” under § 52-572p are separate and distinct defenses. The distinction drawn by the defendant is as follows: common law misuse is the failure to use a product in the manner intended by or reasonably foreseeable to the seller, while alteration/modification by misuse under § 52-572p “changes some essential characteristic of the product so that the user no longer views the product as it was intended by the manufacturer. It makes the user behave differently than he or she would have behaved if the product was not altered.” This is certainly a fine line distinction and would appear, in this case, to be a distinction without a difference.
We agree with the defendant that misuse under the common law “occurs when a product is not used ‘in a manner which should have been foreseen by the defendant.’ ” Norrie v. Heil Co., 203 Conn. 594, 600, 525 A.2d 1332 (1987), quoting Hoelter v. Mohawk Service, Inc., 170 Conn. 495, 517, 365 A.2d 1064 (1976). We also determine in this opinion that the common law [508]*508defense of misuse by a plaintiff may be asserted in a claim brought under the act. We disagree, however, with the claim that the § 52-572p alteration/modification by misuse defense has any application to conduct by a plaintiff.
In reaching our conclusion, we begin with the plain language of the act. “This court has consistently stated that [i]f the language of the statute is clear and unambiguous, it is assumed that the words themselves express the intention of the legislature and there is no room for judicial construction.” (Internal quotation marks omitted.) Vaillancourt v. New Britain Machine/Litton, 224 Conn. 382, 395, 618 A.2d 1340 (1993). By its own terms, § 52-572p limits its application to alterations and modifications made by a “third party.” The term “third party” is not defined in the act. “Where a statute . . . does not define a term, it is appropriate to focus upon its common understanding as expressed in the law and upon its dictionary meaning.” (Internal quotation marks omitted.) AirKaman, Inc. v. Groppo, 221 Conn. 751, 756-57, 607 A.2d 410 (1992). The dictionary definition of “third party” is “[o]ne not a party . . . to . . . an action”; Black’s Law Dictionary (6th Ed. 1990); and therefore does not include a plaintiff.
This conclusion is further reinforced by analyzing § 52-572p within the context of the act as a whole. The act provides the following definition of “claimant”: “[A] person asserting a product liability claim for damages incurred by the claimant or one for whom the claimant is acting in a representative capacity.”10 General Statutes § 52-572m (c). Accordingly, the plaintiff in this case is clearly a “claimant.” If the legislature had intended to include a plaintiff’s conduct under [509]*509§ 52-572p, it would have made the provision expressly applicable to “claimants” as it did with other provisions in the act. See, e.g., General Statutes §§ 52-572o (a) and 52-572q (a) and (b); see also New Haven v. United Illuminating Co., 168 Conn. 478, 485, 362 A.2d 785 (1975) (in determining the meaning of a word or designation, it is appropriate to look to related statutory provisions). Therefore, the legislature appears to have unambiguously crafted an alteration/modification defense that is not applicable to the conduct of a claimant.11
Even if it can be argued that “third party” as set out in § 52-572p is ambiguous, we determine that the “claimant” is not within its scope for several reasons. First, because our Product Liability Act is modeled on the draft act, we look for guidance to commentaries on the draft act. Maloney v. Pac, 183 Conn. 313, [510]*510326-27, 439 A.2d 349 (1981). More specifically, we consult the commentary to § 110 of the draft act because § 52-572p adopted the language of that provision nearly verbatim.12 The commentary states that § 110 of the draft act “deals with the situation where a third party—one other than the product seller or the claimant—has altered or modified the product and this has led to [the] claimant’s harm.”13 (Emphasis added.) 44 Fed. Reg. 3010 (1979).
Second, our conclusion that the § 52-572p alteration/modification defense does not apply to the conduct [511]*511of a claimant is further reinforced by its plain language that, with certain exceptions, provides for a complete bar to recovery when the product has been altered or modified. That statute provides that the product seller “shall not be liable for harm that would not have occurred but for the fact that his product was altered or modified by a third party . . . .”14 (Emphasis added.) Of course, the defendant’s argument that the absolute bar of § 52-572p is applicable to the conduct of a claimant is inconsistent with § 52-572o,15 which provides that [512]*512the claimant’s right to recover is based on pure comparative responsibility. In other words, a partial recovery is allowed even if the claimant’s injury is attributable mostly to his or her conduct.16 “A statute should be read as a whole and interpreted so as to give effect to all of its provisions.” Pintavalle v. Volkanos, 216 Conn. 412, 418, 581 A.2d 1050 (1990). The purpose of this rule is to avoid construing the statutes in such a way as to create a conflict between statutes; “[sjuch . . . reconciliation is especially important in dealing with provisions that are enacted as part of the same legislation.” Malerba v. Cessna Aircraft Co., 210 Conn. 189, 195, 554 A.2d 287 (1989).
Third, construing § 52-572p to apply only to the conduct of persons or entities other than the claimant whose modifications or alterations of the product cause the claimant’s injury is consistent with our common law. Prior to the enactment of the act, we adopted a cause of action in strict tort liability based on the Restatement (Second) of Torts § 402 A. Rossignol v. Danbury School of Aeronautics, Inc., 154 Conn. 549, 559-60, 227 A.2d 418 (1967). Section 402 A shields defendants from liability for products altered or modified by providing that the product seller can be liable only when the seller’s product “was expected to and did reach the user or consumer without substantial change in the condition in which it was sold. ” (Emphasis added.) Prokolkin v. General Motors Corp., 170 Conn. [513]*513289, 299, 365 A.2d 1180 (1976); Rossignol v. Danbury School of Aeronautics, Inc., supra, 559. In other words, the defendant would be absolved of liability under § 402 A if the plaintiffs injury was the result of an alteration or modification to the product made by a third party. See 2 Restatement (Second), Torts § 402 A, comment (g) (1965). “In determining whether or not a statute abrogates or modifies a common-law rule the construction must be strict, and the operation of a statute in derogation of the common law is to be limited to matters clearly brought within its scope.” Willoughby v. New Haven, 123 Conn. 446, 454, 197 A. 85 (1937).
Our conclusion leaves the defense of misuse on the part of the claimant without an express statutory basis in the act. Although § 52-572o, the comparative responsibility provision, is based on and mirrors the first part of § 111 of the draft act, the second part of § 111 extends beyond § 52-572o by expressly delineating the specific types of conduct that are chargeable to the claimant, including misuse.17 The legislative history of our act is silent as to the reason why this part of § 111 was not adopted.
[514]*514Nevertheless, it is apparent that the legislature did not intend to eliminate consideration of the claimant’s conduct in determining liability or the amount of damages. Otherwise, there would be no purpose for adopting the principle of comparative responsibility under § 52-572o. [515]*515“In construing a statute, common sense must be used, and courts will assume that the legislature intended to accomplish a reasonable and rational result.” (Internal quotation marks omitted.) State v. Hinton, 227 Conn. 301, 320, 630 A.2d 593 (1993).
Furthermore, under our common and statutory law, misuse by the claimant is a defense to a product liability action. General Statutes § 52-572l;18 Norrie v. Heil Co., supra, 203 Conn. 594. We will not interpret a statute to have the effect of altering prior statutory or common law unless the language of the statute clearly expresses an intent to have such an effect. Lynn v. Haybuster Mfg., Inc., supra, 226 Conn. 290. No language of the act expresses such an intent. To the contrary, § 52-572o (a) contains broad language requiring the trier of fact to consider “the comparative responsibility of, or attributed to, the claimant, [which] shall not bar recovery but shall diminish the award of compensatory damages proportionately, according to the measure of responsibility attributed to the claimant.” It is reasonable to construe this broad language to incorporate the defense of misuse of a product by a claimant. Accordingly, we conclude that the legislature did not intend to abrogate this common law defense, but rather the act incorporates misuse as part of the consideration of pure comparative fault.
With this statutory construction in mind, we now turn to the trial court’s instructions on misuse. With regard to the first certified question, although our conclusion is based on reasoning not relied upon by the [516]*516Appellate Court, we agree with that court that the defendant was not entitled to a jury instruction on the defense of alteration/modification by misuse under § 52-572p. The trial judge did instruct on misuse under the common law and the defendant does not raise any claim of error in this respect.
In regard to the second certified question, we conclude, and the defendant conceded at oral argument, that comparative responsibility under § 52-572o is applicable to the common law misuse defense. The defendant’s claim that comparative responsibility is not applicable to misuse has reference solely to § 52-572p.
The judgment is affirmed.
In this opinion the other justices concurred.