SPINA, J.

This case presents an issue of statutory interpretation: whether G. L. c. 214, § 1C, which states that "[a] person shall have the right to be free from sexual harassment, as defined in" G. L. c. 151B and c. 151C, applies to volunteers. The plaintiff, a volunteer, brought an action alleging sexual harassment by a former coworker. A judge in the Superior Court granted summary judgment for the defendant because the alleged conduct did not occur in an employment or academic context. The Appeals Court determined that G. L. c. 214, § 1C, creates a cause of action for volunteers and reversed the order. Lowery v. Klemm, 63 Mass. App. Ct. 307 (2005). We granted the defendant's application for further appellate review, and we hold that G. L. c. 214, § 1C, does not apply to volunteers, although volunteers retain their common-law rights regarding sexual harassment. We therefore affirm the order of summary judgment in favor of the defendant.

1. Background. When reviewing a grant of summary judgment, we view the evidence in the light most favorable to the nonmoving party. See Augat, Inc. v. Liberty Mut. Ins. Co., 410 Mass. 117, 120 (1991), citing Mass. R. Civ. P. 56 (c), 365 Mass. 824 (1974). The plaintiff volunteered her time at a "swap shop," operated by the town of Falmouth (town) at its waste management facility. The defendant worked as the gatekeeper and land supervisor at the same facility. He frequently visited the shop and made sexual advances toward the plaintiff for three years, despite her repeated requests that he leave her alone. The town ultimately terminated the plaintiff's volunteer services and issued a no-trespass order, barring her from the facility.

The plaintiff filed a one-count complaint in the Superior Court, alleging that the defendant had harassed her sexually in violation of G. L. c. 214, § 1C. The defendant filed a motion for summary judgment, arguing that the plaintiff had failed to state a claim on which relief could be based because she was not an employee. The judge granted summary judgment for the defendant, reasoning that G. L. c. 214, § 1C, incorporates definitions of "sexual harassment" from G. L. c. 151B and c. 151C, which require that the conduct occur in an employment or academic environment.

The Appeals Court, however, concluded that G. L. c. 214, § 1C, applies to volunteers and reversed the order. Lowery v. Klemm, 63 Mass. App. Ct. 307, 308 (2005). The court discerned "a legislative intent comprehensively and broadly to reach sexual harassment wherever occurring, including in nontraditional employment structures." Id. at 312. The court further noted that the statute's broad language, which grants "[a]ll 'persons'" the right to be free from sexual harassment, and its codification in G. L. c. 214, which confers equity jurisdiction, suggest a statutory reach broad enough to encompass volunteers. Id. at 313-314. Finally, as a matter of public policy, the Appeals Court observed that an interpretation of G. L. c. 214, § 1C, that did not protect volunteers would create unfair and absurd results: volunteer workers could be subject to the same sexual harassment as paid employees, but would lack the statutory remedies afforded them. Id. at 314-315.

2. Discussion. In 1986, the Legislature passed "An Act prohibiting sexual harassment," St. 1986, c. 588, which added a definition of sexual harassment to G. L. c. 151B, § 1 (18), and declared it an "unlawful practice" for an employer or its agents "to sexually harass any employee," G. L. c. 151B, § 4 (16A). See Green v. Wyman-Gordon Co., 422 Mass. 551, 553 (1996) (discussing enactment of St. 1986, c. 588). It also amended G. L. c. 151C to include a definition of sexual harassment, see G. L. c. 151C, § 1 (e) , and made it "an unfair educational practice . . . [t]o sexually harass students in any program or course of study in any educational institution," G. L. c. 151C, § 2 (g). In addition, this legislation created G. L. c. 214, § 1C, which provides that "[a] person shall have the right to be free from sexual harassment, as defined in" G. L. c. 151B and c. 151C, and grants the Superior Court jurisdiction to adjudicate such claims. See Green v. Wyman-Gordon Co., supra at 553, 554.

General Laws c. 151B provides a remedy for sexual harassment involving employers with six or more employees. Guzman v. Lowinger, 422 Mass. 570, 572 (1996). Green v. Wyman-Gordon Co., supra at 559. Plaintiffs alleging sexual harassment in this environment must comply with the procedural requirements of G. L. c. 151B, § 5, by filing a complaint with the Massachusetts Commission Against Discrimination (MCAD) within the statutory time limit. Although the "broad exclusivity provision" of G. L. c. 151B, § 9, precludes plaintiffs from "recasting" their claims of sexual harassment as common-law claims or violations of other statutes, it permits recovery of actual and punitive damages (as well as reasonable attorney's fees and costs). See Green v. Wyman-Gordon Co., supra at 555 (employee's statutory claims alleging violations of civil rights act and equal rights act, and common-law claims for negligence, breach of contract, and intentional and negligent infliction of emotional distress, barred by exclusivity provisions of G. L. c. 151B and workers' compensation act). See Doe v. Purity Supreme, Inc., All Mass. 563, 565-567 (1996) (employee's common-law claims for negligence, assault and battery, and intentional and negligent infliction of emotional distress barred by exclusivity provision of workers' compensation act; statutory claims barred by exclusivity provision of G. L. c. 151B).

General Laws c. 214, § 1C, supplements G. L. c. 151B by ensuring "that all employees are protected against sexual harassment in the workplace, whether or not their employers fit within the definition in c. 151B" (emphasis in original). Green v. Wyman-Gordon Co., supra at 557. General Laws c. 214, § 1C, thus extends statutory protection from sexual harassment to employees of employers with fewer than six workers. Id. Like G. L. c. 151B, when G. L. c. 214, § 1C, applies to a claim of sexual harassment, it is the exclusive remedy: plaintiffs may not proceed with other statutory or common-law actions for sexual harassment. See Guzman v. Lowinger, supra at 572 ("Just as G. L. c. 15 IB provides an exclusive remedy for sexual harassment claims against employers with six or more employees, G. L. c. 214, § 1C, provides the exclusive remedy for such claims against employers of fewer than six employees").

The defendant contends that G. L. c. 214, § 1C, incorporates the entire definition of sexual harassment contained in G. L. c. 151B, § 1 (18), and G. L. c. 151C, § 1 (e) , and that it therefore provides statutory protection only from sexual harassment that affects a person's employment or education. The defendant emphasizes that victims of sexual harassment in other contexts are not without remedy: unlike employees and students, they may pursue common-law claims against alleged offenders. The plaintiff, however, urges us to adopt an interpretation of G. L. c. 214, § 1C, that is not limited to employment and academic settings, because it grants the right to be free from sexual harassment to "a person," not "an employee" or "a student." The plaintiff claims that the Legislature intended to incorporate into G. L. c. 214, § 1C, only the part of the definition of sexual harassment that appears in both G. L. c. 151B and c. 151C: "The term 'sexual harassment' shall mean sexual advances, requests for sexual favors, and other verbal or physical conduct of a sexual nature," without any reference to an employment or academic environment. The plaintiff further argues that the Legislature already has addressed the issue of sexual harassment in the workplace and academia, and that limiting the scope of G. L. c. 214, § 1C, to those environments would leave it "entirely duplicative" of G. L. c. 151B and c. 151C.

"The general and familiar rule is that a statute must be interpreted according to the intent of the Legislature ascertained from all its words construed by the ordinary and approved usage of the language, considered in connection with the cause of its enactment, the mischief or imperfection to be remedied and the main object to be accomplished." Hanlon v. Rollins, 286 Mass. 444, 447 (1934). "[T]he primary source of insight into the intent of the Legislature is the language of the statute." International Fid. Ins. Co. v. Wilson, 387 Mass. 841, 853 (1983). We therefore begin with the plain language of G. L. c. 214, § IC: "A person shall have the right to be free from sexual harassment, as defined in chapter[s 151B and 151C]." Although we agree with the plaintiff that "person" is a broad term, the definitions of sexual harassment in G. L. c. 151B and c. 151C, expressly incorporated into G. L. c. 214, § IC, limit the reach of that statute: these provisions define as "sexual harassment" only conduct that affects "a term or condition of employment" or serves as "a basis for employment decisions," G. L. c. 151B, § 1 (18) (a); creates "an intimidating, hostile, humiliating or sexually offensive work environment," G. L. c. 151B, § 1 (18) (b); functions as "a basis for the evaluation of academic achievement" or otherwise affects academic placement or privileges, G. L. c. 151C, § 1 (e) (i); or creates "an intimidating, hostile, humiliating or sexually offensive educational environment," G. L. c. 151C, § 1 (e) (ii).

A statute must be interpreted to give effect "to all its provisions, so that no part will be inoperative or superfluous." Bankers Life Cas. Co. v. Commissioner of Ins., 427 Mass. 136, 140 (1998), quoting 2A B. Singer, Sutherland Statutory Construction § 46.06 (5th ed. 1992). The plaintiffs interpretation of G. L. c. 214, § IC, would require us to ignore much of the definition of "sexual harassment" provided in G. L. c. 151B and c. 151C. We agree with the defendant that, had the Legislature intended to incorporate only part of these definitions, it would have done so explicitly. Cf. Vicarelli v. Business Int'l, Inc., 973 F. Supp. 241, 245 (D. Mass. 1997) ("The Legislature could have provided a broader definition for sexual harassment in [G. L. c] 214, § IC, or it could have enacted provisions that would have explicitly protected [volunteers] from sexual harassment"). We accordingly construe G. L. c. 214, § IC, to incorporate the complete definitions of "sexual harassment" found in G. L. c. 151B, § 1 (18), and G. L. c. 151C, § 1 ( e), which limit statutory protection to conduct occurring in the employment and academic contexts.

Contrary to the plaintiff's contention, our interpretation of G. L. c. 214, § IC, does not render that statute duplicative of G. L. c. 151B and c. 151C. General Laws c. 214, § IC, fills a gap in the statutory scheme by creating a cause of action for sexual harassment for employees who are not protected by G. L. c. 151B. Guzman v. Lowinger, All Mass. 570, 572-573 (1996). It also "provides exclusive jurisdiction in the Superior Court for any sexual harassment claim that is brought in the courts because . . . the employer is not covered by c. 151B." Green v. Wyman-Gordon Co., All Mass. 551, 557 (1996). In addition, the statute gives students who are sexually harassed in violation of G. L. c. 15 IC, § 2 (g), access to the remedial provisions of G. L. c. 151B, § 9. See Morrison v. Northern Essex Community College, 56 Mass App. Ct. 784, 786 n. 6 (2002). General Laws c. 214, § IC, thus extends to employees and students protection that is not otherwise available under G. L. c. 151B and c. 151C; it does not duplicate the relief provided by those statutes.

Moreover, we will not adopt a construction of a statute that creates "absurd or unreasonable" consequences. Attorney Gen. v. School Comm. of Essex, 387 Mass. 326, 336 (1982). The plaintiffs interpretation of G. L. c. 214, § IC, would result in a statutory scheme that gives volunteers greater rights than employees. The workers' compensation statute, G. L. c. 152, precludes employees from bringing common-law actions for personal injuries, including emotional harm, arising "out of and in the course of . . . employment." See Foley v. Polaroid Corp., 381 Mass. 545, 548-550 (1980), quoting G. L. c. 152, § 26. While the exclusivity provisions of G. L. c. 151B, § 9, and G. L. c. 214, § 1C, prohibit plaintiffs from framing sexual harassment as a violation of another statute, or as a commonlaw claim, the workers' compensation statute bars employees' claims for other injuries related to workplace sexual harassment. See Doe v. Purity Supreme, Inc., 422 Mass. 563 (1996); Green v. Wyman-Gordon Co., supra at 558 ("common law claims not barred by c. 151B, notably the claims for intentional and negligent infliction of emotional distress, are barred by the exclusivity provision of the workers' compensation act"). Because the workers' compensation statute does not apply to volunteers, however, their common-law claims relating to sexual harassment are not similarly barred. See Vicarelli v. Business Int'l, Inc., 973 F. Supp. 241, 245-246 (D. Mass. 1997) (granting motion to dismiss sexual harassment claim under G. L. c. 214, § 1C, because statute does not apply to independent contractors, but denying motion to dismiss claims for intentional and negligent infliction of emotional distress). If we were to conclude that G. L. c. 214, § 1C, covered volunteers, then volunteers could pursue common-law claims for injuries related to sexual harassment as well as claims under G. L. c. 214, § 1C, whereas employees would be limited to statutory claims under G. L. c. 151B or G. L. c. 214, § 1C. The plaintiff does not argue that the Legislature intended to give volunteers more rights and remedies than employees, and we see nothing in the statute itself, its legislative history, or our cases to support such an outcome.

The plaintiffs proposed interpretation of G. L. c. 214, § 1C, also would have the peculiar effect of making it more difficult for employees to prove sexual harassment than nonemployees. An employee alleging sexual harassment would be required to demonstrate that (1) a defendant made sexual advances, requested sexual favors, or engaged in other conduct of a sexual nature; and that (2) the employee's submission to this conduct was a term of employment or the basis of employment decisions; or that (3) this conduct created a hostile work environment. See G. L. c. 151B, § 1 (18). If only the first part of the definition of sexual harassment contained in G. L. c. 151B, § 1 (18), is incorporated into G. L. c. 214, § 1C, however, nonemployees like the plaintiff would have to prove merely that the defendant made sexual advances, requested sexual favors, or engaged in other conduct of a sexual nature to establish their claim. Given the emphasis on the problem of workplace sexual harassment in the over-all statutory scheme, we do not believe that the Legislature intended to make it more difficult for employees — one of the groups singled out for protection when the statutory prohibition on sexual harassment was first enacted — to bring such claims. See Guzman v. Lowinger, supra at 573; Green v. Wyman-Gordon Co., supra at 553.

Finally, we emphasize that volunteers, like the plaintiff, who experience sexual harassment are not without recourse: although not protected by G. L. c. 214, § 1C, they may bring actions under other statutes, including the civil rights act, G. L. c. 12, § 111, as well as common-law claims for sexual harassment or related injuries that would be barred for employees by the exclusivity provisions of G. L. c. 151B, § 9; G. L. c. 214C, § 1C; and the workers' compensation statute. Because volunteers retain these common-law rights and remedies, our decision today does not leave employers free to sexually harass volunteers with impunity. It may be, as the Appeals Court noted, that volunteers do not enjoy protection as extensive as that granted to students and employees. See Lowery v. Klemm, 63 Mass. App. Ct. 307, 314-315 n. 7 (2005) (noting that G. L. c. 151B, § 9, and G. L. c. 214, § 1C, "provide greater protections and grant a broader array of remedies and tools for enforcement than are available at common law"). However, this reflects a legislative policy judgment, and "[t]hat public policy is entitled to deference. . . . Whether a statute is wise or effective is not within the province of courts." Commonwealth v. Leno, 415 Mass. 835, 841 (1993), citing Commonwealth v. Lammi, 386 Mass. 299, 300 (1982). The Legislature may have considered that employees, who generally depend on their jobs for their livelihood, need greater protection from sexual harassment than volunteers, who are uncompensated and therefore more free to leave an uncomfortable workplace environment.

3. Conclusion. For the foregoing reasons, we agree with the Superior Court judge's ruling that G. L. c. 214, § 1C, applies only in the employment and academic contexts, and does not provide a statutory cause of action to volunteers. "An order granting or denying summary judgment will be upheld if the trial judge ruled on undisputed material facts and his ruling was correct as a matter of law." Commonwealth v. One 1987 Mercury Cougar Auto., 413 Mass. 534, 536 (1992), citing Community Nat'l Bank v. Dawes, 369 Mass. 550, 556 (1976). Because we conclude that the judge ruled correctly as a matter of law, and no disputed issue of material fact exists, we affirm the judgment of the Superior Court. So ordered.