OPINION OF THE COURT
POMEROY, Justice.
The question presented by this appeal is whether, in an arbitration of a grievance by public employees under a collective bargaining agreement, an award sustaining the grievance may properly be based on a practice of the parties which had obtained during a period prior to the agreement. Under the facts of this case and in light of the terms of the agreement, which contains no past practice clause nor any mention of the practice in question, but does contain an integration clause, we answer the question in the negative.
This case was initiated by the appellant, Allegheny County Prison Employees Independent Union (hereinafter “Union”) when on May 10, 1972, it filed a grievance against the County of Allegheny (hereinafter “County”) under the pro[30]*30visions of a collective bargaining agreement between the parties.1 The grievance concerned two aspects of mealtime conditions for guards working at the Allegheny County jail: The Union demanded that the officers’ lounge where the guards took their meals be supervised at mealtime by a guard and 'that the guards be able to select for their meals any food available from the jail kitchen rather than being limited to the menus offered to the prisoners. The matter proceeded to arbitration and, following a hearing in which the County entered only a “special” appearance, the arbitrator issued an award which agreed with appellant’s position and sustained the grievance. On appeal, the Commonwealth Court, in a unanimous opinion, set aside the arbitrator’s award. County of Allegheny v. Allegheny Cty. Pris. Emp. I. U., 20 Pa.Cmwlth. 173, 341 A.2d 578 (1975).2 This Court then granted the Union’s petition for allowance of appeal.
The ultimate question before us is whether the arbitrator’s interpretation of the collective bargaining agreement3 [31]*31“ ‘can in any rational way be derived from the agreement, viewed in the light of its language, context, and any other indicia of the parties’ intention . . . 4 Because we conclude that the negative answer which the Commonwealth Court gave to this question was correct, we affirm its order setting aside the award.
I.
The threshold question in this case is whether the subject matter of the asserted grievance was arbitrable. As this Court noted in Board of Education of Philadelphia v. Federation of Teachers Local No. 3, 464 Pa. 92, 99, 346 A.2d 35, 39 (1975),5 Pennsylvania labor policy not only favors but requires the submission to arbitration of public employee grievances “arising out of the interpretation of the provisions of a collective bargaining agreement”.6 See also Lincoln System of Education v. Lincoln Association of University Professors, 467 Pa. 112, 354 A.2d 576 (1976). From this policy is derived the corollary principle that where, as here, an arbitrator has interpreted a collective bargaining agree[32]*32ment in favor of the arbitrability of the grievance before him, a reviewing court should be slow indeed to disagree.7 As the Supreme Court of the United States observed in United Steelworkers of America v. Warrior & Gulf Navigation Company, 363 U.S. 574, 584-85, 80 S.Ct. 1347, 1354, 4 L.Ed.2d 1409 (1960):
“In the absence of any express provision excluding a particular grievance from arbitration, we think only the most forceful evidence of a purpose to exclude the claim from arbitration can prevail, particularly where, as here, the exclusion clause is vague and the arbitration clause quite broad.” (Emphasis added).
After reviewing the applicable clauses of the collective bargaining agreement in question8 we cannot say that the arbitrator was in error when he concluded that the dispute concerning the mealtime conditions of the employee guards arose out of the interpretation or application of the provisions of the agreement. We must, therefore, disagree with [33]*33the Commonwealth Court insofar as it held that the grievance filed by the Union was not arbitrable.
II.
Turning to the substantive question of whether the arbitrator’s award had a rational basis in the collective bargaining agreement, we must conclude that it did not. The agreement contains no provision whatever which deals either with the question of security arrangements for the employees’ mealtimes or with what food should be available to the employees from the prison kitchen.9
The arbitrator’s decision that the union members were entitled to choose for their luncheons any food available in the prison kitchen and were not limited to the items available on the daily prison menu was based on what he found to have been the past practice of the parties over a period of time, a practice which, so the arbitrator held, had been implicitly incorporated in the collective bargaining agreement which became effective in 1972.10
[34]*34A recognized commentator11 in the field of labor law identifies four situations in which evidence of past practice12 is used in arbitrations: (1) to clarify ambiguous language; (2) to implement contract language which sets forth only a general rule; (3) to modify or amend apparently unambiguous language which has arguably been waived by the parties; and (4) to create or prove a separate, enforceable condition of employment which cannot be derived from the express language of the agreement. In the case at bar, the arbitrator concluded that the implementation by the County [35]*35of the advisory recommendation of a panel of arbitrators in 196713 created a binding past practice, a clear example of the fourth use of past practices in the above formulation. With this implementation, the arbitrator held,
“ . . . the Guards acquired a working condition which constituted a recognizable benefit. Its constant, continual use caused the benefit to ripen into a binding practice. . The privilege given to each Guard to choose his meal from the available kitchen foods became one of the many day-to-day facets of the working relationship between the Prison administration and its Guards. . . ”
Record at 13a.14
[36]*36As for the Union demand for protection of its members by a guard posted in the officers’ lounge at mealtimes, the arbitrator concluded that a “slightly different” problem was involved but that the contractual reservation to the County in Article XII of all responsibility relating to security, see n.8, supra,
“must be interpreted in a reasonable fashion. The Union is not seeking to interfere with the security of the Prison.
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OPINION OF THE COURT
POMEROY, Justice.
The question presented by this appeal is whether, in an arbitration of a grievance by public employees under a collective bargaining agreement, an award sustaining the grievance may properly be based on a practice of the parties which had obtained during a period prior to the agreement. Under the facts of this case and in light of the terms of the agreement, which contains no past practice clause nor any mention of the practice in question, but does contain an integration clause, we answer the question in the negative.
This case was initiated by the appellant, Allegheny County Prison Employees Independent Union (hereinafter “Union”) when on May 10, 1972, it filed a grievance against the County of Allegheny (hereinafter “County”) under the pro[30]*30visions of a collective bargaining agreement between the parties.1 The grievance concerned two aspects of mealtime conditions for guards working at the Allegheny County jail: The Union demanded that the officers’ lounge where the guards took their meals be supervised at mealtime by a guard and 'that the guards be able to select for their meals any food available from the jail kitchen rather than being limited to the menus offered to the prisoners. The matter proceeded to arbitration and, following a hearing in which the County entered only a “special” appearance, the arbitrator issued an award which agreed with appellant’s position and sustained the grievance. On appeal, the Commonwealth Court, in a unanimous opinion, set aside the arbitrator’s award. County of Allegheny v. Allegheny Cty. Pris. Emp. I. U., 20 Pa.Cmwlth. 173, 341 A.2d 578 (1975).2 This Court then granted the Union’s petition for allowance of appeal.
The ultimate question before us is whether the arbitrator’s interpretation of the collective bargaining agreement3 [31]*31“ ‘can in any rational way be derived from the agreement, viewed in the light of its language, context, and any other indicia of the parties’ intention . . . 4 Because we conclude that the negative answer which the Commonwealth Court gave to this question was correct, we affirm its order setting aside the award.
I.
The threshold question in this case is whether the subject matter of the asserted grievance was arbitrable. As this Court noted in Board of Education of Philadelphia v. Federation of Teachers Local No. 3, 464 Pa. 92, 99, 346 A.2d 35, 39 (1975),5 Pennsylvania labor policy not only favors but requires the submission to arbitration of public employee grievances “arising out of the interpretation of the provisions of a collective bargaining agreement”.6 See also Lincoln System of Education v. Lincoln Association of University Professors, 467 Pa. 112, 354 A.2d 576 (1976). From this policy is derived the corollary principle that where, as here, an arbitrator has interpreted a collective bargaining agree[32]*32ment in favor of the arbitrability of the grievance before him, a reviewing court should be slow indeed to disagree.7 As the Supreme Court of the United States observed in United Steelworkers of America v. Warrior & Gulf Navigation Company, 363 U.S. 574, 584-85, 80 S.Ct. 1347, 1354, 4 L.Ed.2d 1409 (1960):
“In the absence of any express provision excluding a particular grievance from arbitration, we think only the most forceful evidence of a purpose to exclude the claim from arbitration can prevail, particularly where, as here, the exclusion clause is vague and the arbitration clause quite broad.” (Emphasis added).
After reviewing the applicable clauses of the collective bargaining agreement in question8 we cannot say that the arbitrator was in error when he concluded that the dispute concerning the mealtime conditions of the employee guards arose out of the interpretation or application of the provisions of the agreement. We must, therefore, disagree with [33]*33the Commonwealth Court insofar as it held that the grievance filed by the Union was not arbitrable.
II.
Turning to the substantive question of whether the arbitrator’s award had a rational basis in the collective bargaining agreement, we must conclude that it did not. The agreement contains no provision whatever which deals either with the question of security arrangements for the employees’ mealtimes or with what food should be available to the employees from the prison kitchen.9
The arbitrator’s decision that the union members were entitled to choose for their luncheons any food available in the prison kitchen and were not limited to the items available on the daily prison menu was based on what he found to have been the past practice of the parties over a period of time, a practice which, so the arbitrator held, had been implicitly incorporated in the collective bargaining agreement which became effective in 1972.10
[34]*34A recognized commentator11 in the field of labor law identifies four situations in which evidence of past practice12 is used in arbitrations: (1) to clarify ambiguous language; (2) to implement contract language which sets forth only a general rule; (3) to modify or amend apparently unambiguous language which has arguably been waived by the parties; and (4) to create or prove a separate, enforceable condition of employment which cannot be derived from the express language of the agreement. In the case at bar, the arbitrator concluded that the implementation by the County [35]*35of the advisory recommendation of a panel of arbitrators in 196713 created a binding past practice, a clear example of the fourth use of past practices in the above formulation. With this implementation, the arbitrator held,
“ . . . the Guards acquired a working condition which constituted a recognizable benefit. Its constant, continual use caused the benefit to ripen into a binding practice. . The privilege given to each Guard to choose his meal from the available kitchen foods became one of the many day-to-day facets of the working relationship between the Prison administration and its Guards. . . ”
Record at 13a.14
[36]*36As for the Union demand for protection of its members by a guard posted in the officers’ lounge at mealtimes, the arbitrator concluded that a “slightly different” problem was involved but that the contractual reservation to the County in Article XII of all responsibility relating to security, see n.8, supra,
“must be interpreted in a reasonable fashion. The Union is not seeking to interfere with the security of the Prison. On the contrary, it is trying to insure the physical safety of its member Guards. . . . The Prison was sufficiently concerned about the problem to provide a Guard over the residents when employees ate in the Prison kitchen. There is no reason why the same protection ought not to be afforded to employees while they are eating in the Officers’ Lounge.” Record at 15a.
The question for decision is whether the arbitrator was correct in concluding that the parties to the contract here involved implicitly incorporated into it, as separately enforceable conditions of their employment relationship, practices relative to food and security at lunch times which had prevailed for a time in the past, when those practices are neither repudiated in the agreement nor inconsistent with its. terms, but when the contract includes a broad clause to the effect that the agreement as written is the complete agreement between the parties.15 Although the non-inclu[37]*37sion of the practices in the bargaining agreement does not necessarily compel the conclusion that past practices are not impliedly so incorporated,16 the existence in a contract of a broad integration clause, if it means anything, does clearly negate the notion that the parties meant to include any terms or conditions, including those based only on past practices, not specifically incorporated in the written contract or reasonably inferable from its provisions. We think that this provision is dispositive of this case.17 At least one arbitrator has expressly so held, Lone Star Brewing Co., 53 [38]*38LA 1317 (1969) (LeRoy Autrey), and we know of no decision to the contrary. See also Cox & Dunlop, The Duty to Bargain Collectively During the Term of an Existing Agreement, 63 Harv.L.Rev. 1097, 1116-1117 (1950).
In deciding as we do, we hold only that where a collective bargaining agreement not only makes no mention whatever of past practices but does include a broad integration clause, an award which incorporates into the agreement, as separately enforceable conditions of the employment relationship, past practices which antedate the effective date of that agreement cannot be said to “draw its essence from the collective bargaining” agreement.18 United Steelworkers v. Enterprise Wheel and Car Corp., 363 U.S. 593, 596, 80 S.Ct. 1358, 4 L.Ed.2d 1424 (1960). We hasten to add that courts are not to become super-arbitrators and are bound to defer to the arbitrators’ findings relative to the intent of the parties as the arbitrators perform their task of interpreting labor contracts negotiated under PERA. See Community College of Beaver County v. Community College of Beaver County, Society of the Faculty, 473 Pa. 576, 375 A.2d 1267 (1977). The able arbitrator in this case, however, was not so much interpreting the contract before him as he was declaring, no doubt out of his conviction of what was fair and reasonable, that the employer should be bound by a non-existent provision which the arbitrator then incorporates into the contract by implication. But there is here nothing to support the implication. Conceding that the past attitude of the management of the County’s prison may have been [39]*39petty, it is nevertheless a function of future bargaining to remedy the situation. For the arbitrator to seek to supply the remedy is on these facts not in accord with the approach of Enterprise, supra, which we have adopted as the proper one for applying the Arbitration Act in public employment contracts. The award must, therefore, be set aside. See Sec. 11(d) of the Act of April 25, 1927, P.L. 381, No. 248, 5 P.S. § 171(d); Community College of Beaver County, supra.
What we have said, of course, is not to suggest that in another case the evidence may not justify a contrary conclusion. Nor do we intend to say that an arbitrator’s reliance on past practices to clarify ambiguous language in the collective bargaining agreement, to implement general contract language or to show that a specific provision in the contract has been waived by the parties, would be improper although the agreement in question included an integration clause.19
The order of the Commonwealth Court is affirmed.
NIX, J., did not participate in the consideration or decision of this case.
JONES, Former C. J., did not participate in the decision of this case.
ROBERTS, J., filed a dissenting opinion.
MANDERINO, J., filed a dissenting opinion.