OPINION
BURKE, Justice.
I
These consolidated appeals address the state’s right to unilaterally change employment terms governing Class II and Class III employees before the employees hold a strike vote. The superior court ruled that the state’s unilateral change of wage and employment conditions of Class II and Class III employees did not violate the Public Employment Relations Act (PERA), AS 23.40.070. — 23.40.260, or article I, section 18 of the Alaska Constitution. We affirm.
II
The Alaska Public Employees Association (APEA) and Public Employees Local 71 are certified labor organizations. APEA represents 8,000 Class I, II, and III employ[1031]*1031ees. Local 71 represents 1,600 Class I, II, and III employees.
Under PERA, employees are divided into three classes, I, II, and III. Class I employees1 may never strike because their services are necessary for the public’s protection. AS 23.40.200(b). Class II employees2 have a limited right to strike. AS 23.40.200(c). After an impasse in negotiations, Class II employees must submit to mediation. Id. If mediation fails, Class II employees can strike upon a majority vote of the employees. Id. The employees can only continue to strike as long as the public’s health, safety or welfare is not endangered. Id. The public employer can seek to enjoin the strike. If the strike is enjoined and the parties are still at an impasse, the parties “shall submit to arbitration.” Id. Class III employees, all other employees, can also strike after an impasse in negotiations as long as a majority of the employees vote by secret ballot for a strike. AS 23.40.200(d).
APEA and the state were parties to a collective bargaining agreement in effect between April 1984 and June 1987.3 Local 71 and the state also had a collective bargaining agreement in effect from April 1984 until January 1987.
The state and the unions were not able to agree on a new contract after the agreements expired. Although the parties honored the original agreements during negotiations, on October 6, 1987, the state notified APEA, and on August 11, 1987, notified Local 71, that it would implement unilateral changes in the terms and conditions of employment effective October 16, 1987.4 APEA and the state stipulated that their negotiations were at an impasse on October 16, 1987.
The unions sought declaratory and in-junctive relief from the imposition of unilateral contract changes. The superior court entered an order temporarily restraining the state from unilaterally increasing the work week from 37.5 to 40 hours and from taking away a Monday holiday but denied all other injunctive relief requested by the unions. The state later agreed to reinstate the former wages and terms of employment while this litigation was pending.5
On February 11, 1988, Superior Court Judge Brian C. Shorten ruled on the declaratory judgment brought by the unions and held that the state may change terms and conditions of employment of Class II and Class III employees upon an impasse in negotiations whether or not the employees have held a strike vote.6 The court also ruled that the employees were not deprived of property without just compensation by the unilateral imposition of contract terms. The unions appealed these rulings.
Ill
APEA and Local 71 argue that AS 23.40.200 prohibits the state from imposing unilateral contract changes before Class II and Class III employees conduct a strike vote. The state contends that it may [1032]*1032impose unilateral changes when the parties reach an impasse in negotiations.
The dispute resolution process for public employees is governed by PERA.7 One of the primary purposes of the act is to provide guidelines for public employment relations. AS 23.40.070. PERA attempts to balance the state’s need for uninterrupted services and the employees’ need for effective bargaining tools. However, PERA does not expressly permit or prohibit the state from unilaterally changing contract terms.
We look first to the National Labor Relations Act (NLRA), 29 U.S.C. §§ 159-68 (1982), for guidance. We have followed federal decisions interpreting the NLRA when the provisions of the NLRA are similar to state statutes.8 See Alaska Community Colleges’ Fed’n of Teachers, Local 2404 v. University of Alaska, 669 P.2d 1299 (Alaska 1983); Northwest Arctic Regional Educ. Attendance Area v. Alaska Pub. Serv. Employees, Local 71, 591 P.2d 1292, 1295 n. 5 (Alaska 1979); Alaska Pub. Employees Ass’n v. Municipality of Anchorage, 555 P.2d 552, 553 (Alaska 1976).
The NLRA does not directly address the question of whether an employer can unilaterally implement contract terms after an impasse in negotiations. However, certain principles have been established in decisions addressing the question whether unilateral implementation of contract terms is [1033]*1033an unfair labor practice under section 158(d)9 of the NLRA.
An employer that implements unilateral changes in the conditions of employment during contract negotiations without consulting the union violates the duty to bargain collectively. First Nat’l Maintenance Corp. v. NLRB, 452 U.S. 666, 674,101 S.Ct. 2573, 2578, 69 L.Ed.2d 318, 328 (1981); NLRB v. Katz, 369 U.S.. 736, 742-43, 82 S.Ct. 1107, 1111, 8 L.Ed.2d 230, 236 (1962). When an impasse occurs, after the breakdown of good faith negotiations, the employer is free to unilaterally implement terms of employment, provided the changes were offered to the union during the bargaining process. Id.
However, an employer cannot purposefully negotiate in bad faith in order to cause an impasse and then impose a unilateral change in working conditions. NLRB v. Southwest Sec. Equip. Corp., 736 F.2d 1332, 1337 (9th Cir.1984) (“The well-established presumption is that an employer violates his § 8(a)(5) duty to bargain in good faith if he unilaterally changes the terms of a collective agreement, even after that agreement has expired. [A unilateral change will not be allowed] until the parties negotiate a new agreement or bargain in good faith to impasse.”). The question whether the parties negotiated to impasse in good faith must be determined on a case-by-case basis. NLRB v. Yama Woodcraft, Inc., 580 F.2d 942, 944 (9th Cir.1978), (quoting Dallas Gen. Drivers, W. & H., Local 745 v. NLRB, 355 F.2d 842, 845 (D.C.Cir.1966)).
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OPINION
BURKE, Justice.
I
These consolidated appeals address the state’s right to unilaterally change employment terms governing Class II and Class III employees before the employees hold a strike vote. The superior court ruled that the state’s unilateral change of wage and employment conditions of Class II and Class III employees did not violate the Public Employment Relations Act (PERA), AS 23.40.070. — 23.40.260, or article I, section 18 of the Alaska Constitution. We affirm.
II
The Alaska Public Employees Association (APEA) and Public Employees Local 71 are certified labor organizations. APEA represents 8,000 Class I, II, and III employ[1031]*1031ees. Local 71 represents 1,600 Class I, II, and III employees.
Under PERA, employees are divided into three classes, I, II, and III. Class I employees1 may never strike because their services are necessary for the public’s protection. AS 23.40.200(b). Class II employees2 have a limited right to strike. AS 23.40.200(c). After an impasse in negotiations, Class II employees must submit to mediation. Id. If mediation fails, Class II employees can strike upon a majority vote of the employees. Id. The employees can only continue to strike as long as the public’s health, safety or welfare is not endangered. Id. The public employer can seek to enjoin the strike. If the strike is enjoined and the parties are still at an impasse, the parties “shall submit to arbitration.” Id. Class III employees, all other employees, can also strike after an impasse in negotiations as long as a majority of the employees vote by secret ballot for a strike. AS 23.40.200(d).
APEA and the state were parties to a collective bargaining agreement in effect between April 1984 and June 1987.3 Local 71 and the state also had a collective bargaining agreement in effect from April 1984 until January 1987.
The state and the unions were not able to agree on a new contract after the agreements expired. Although the parties honored the original agreements during negotiations, on October 6, 1987, the state notified APEA, and on August 11, 1987, notified Local 71, that it would implement unilateral changes in the terms and conditions of employment effective October 16, 1987.4 APEA and the state stipulated that their negotiations were at an impasse on October 16, 1987.
The unions sought declaratory and in-junctive relief from the imposition of unilateral contract changes. The superior court entered an order temporarily restraining the state from unilaterally increasing the work week from 37.5 to 40 hours and from taking away a Monday holiday but denied all other injunctive relief requested by the unions. The state later agreed to reinstate the former wages and terms of employment while this litigation was pending.5
On February 11, 1988, Superior Court Judge Brian C. Shorten ruled on the declaratory judgment brought by the unions and held that the state may change terms and conditions of employment of Class II and Class III employees upon an impasse in negotiations whether or not the employees have held a strike vote.6 The court also ruled that the employees were not deprived of property without just compensation by the unilateral imposition of contract terms. The unions appealed these rulings.
Ill
APEA and Local 71 argue that AS 23.40.200 prohibits the state from imposing unilateral contract changes before Class II and Class III employees conduct a strike vote. The state contends that it may [1032]*1032impose unilateral changes when the parties reach an impasse in negotiations.
The dispute resolution process for public employees is governed by PERA.7 One of the primary purposes of the act is to provide guidelines for public employment relations. AS 23.40.070. PERA attempts to balance the state’s need for uninterrupted services and the employees’ need for effective bargaining tools. However, PERA does not expressly permit or prohibit the state from unilaterally changing contract terms.
We look first to the National Labor Relations Act (NLRA), 29 U.S.C. §§ 159-68 (1982), for guidance. We have followed federal decisions interpreting the NLRA when the provisions of the NLRA are similar to state statutes.8 See Alaska Community Colleges’ Fed’n of Teachers, Local 2404 v. University of Alaska, 669 P.2d 1299 (Alaska 1983); Northwest Arctic Regional Educ. Attendance Area v. Alaska Pub. Serv. Employees, Local 71, 591 P.2d 1292, 1295 n. 5 (Alaska 1979); Alaska Pub. Employees Ass’n v. Municipality of Anchorage, 555 P.2d 552, 553 (Alaska 1976).
The NLRA does not directly address the question of whether an employer can unilaterally implement contract terms after an impasse in negotiations. However, certain principles have been established in decisions addressing the question whether unilateral implementation of contract terms is [1033]*1033an unfair labor practice under section 158(d)9 of the NLRA.
An employer that implements unilateral changes in the conditions of employment during contract negotiations without consulting the union violates the duty to bargain collectively. First Nat’l Maintenance Corp. v. NLRB, 452 U.S. 666, 674,101 S.Ct. 2573, 2578, 69 L.Ed.2d 318, 328 (1981); NLRB v. Katz, 369 U.S.. 736, 742-43, 82 S.Ct. 1107, 1111, 8 L.Ed.2d 230, 236 (1962). When an impasse occurs, after the breakdown of good faith negotiations, the employer is free to unilaterally implement terms of employment, provided the changes were offered to the union during the bargaining process. Id.
However, an employer cannot purposefully negotiate in bad faith in order to cause an impasse and then impose a unilateral change in working conditions. NLRB v. Southwest Sec. Equip. Corp., 736 F.2d 1332, 1337 (9th Cir.1984) (“The well-established presumption is that an employer violates his § 8(a)(5) duty to bargain in good faith if he unilaterally changes the terms of a collective agreement, even after that agreement has expired. [A unilateral change will not be allowed] until the parties negotiate a new agreement or bargain in good faith to impasse.”). The question whether the parties negotiated to impasse in good faith must be determined on a case-by-case basis. NLRB v. Yama Woodcraft, Inc., 580 F.2d 942, 944 (9th Cir.1978), (quoting Dallas Gen. Drivers, W. & H., Local 745 v. NLRB, 355 F.2d 842, 845 (D.C.Cir.1966)). Thus, in certain cases, even if the unilateral policy change has first been presented to the union on the bargaining table, its imposition may not be permitted. Saunders House v. NLRB, 719 F.2d 683, 688 (3d Cir.1983) (“A concession by one party on a significant issue in dispute precludes a finding of impasse even if a wide gap between the parties remains because under such circumstances there is reason to believe that further bargaining might produce additional movement.”). However, whether the parties have reached a good faith impasse is not at issue in this case because the parties stipulated that they had reached a good faith impasse.
Applying these principles to the instant cases, we believe that the state may implement unilateral contract changes when negotiations reach an impasse. For Class II employees, an impasse is reached when the parties have reached a good faith impasse and the mediation process has been exhausted. For Class III employees, an impasse is reached when negotiations are deadlocked.10
IV
APEA and Local 71 assert that the employees were deprived of property without just compensation when the state demanded that they work longer hours for less pay. Alaska Const, art. I, § 18.11
In order to state a claim under article I, section 18, the employees must have been deprived of a property interest. We have already ruled that the employees have no right to be paid according to the plan in AS [1034]*103439.27.011; absent a legal entitlement, they were not deprived of property by the salary reduction.
Although an individual may be entitled to just compensation when his labor is taken, DeLisio v. Alaska Superior Court, 740 P.2d 437, 439-43 (Alaska 1987), the employees have no legal right to work a week totalling thirty-seven and one-half hours. Once a collective bargaining agreement has expired, the continuation of existing terms and conditions is a mere expectancy. Cf. Strok v. Alaska State Hous. Auth., 459 P.2d 480, 482 (Alaska 1969) (tenant’s expectation of renewal of a lease was not a compensable interest). Therefore, the employees were not deprived of property by the extension of their work hours.
The unilateral contract changes imposed by the state did not deprive the employees of a property interest protected by article I, section 18.
AFFIRMED.