In Pittsburgh Joint Collective Bargaining Committee v. City of Pittsburgh, 481 Pa. 66, 391 A.2d 1318 (1978), the Supreme Court rejected the city's assertions that a CBA's grievance arbitration provisions violated statutory law. Stressing the importance of the development and maintenance of harmonious relationships between the public employer and its employees, the Court explained that good faith bargaining required questions as to the legality of proposed terms of a CBA to be resolved at the bargaining stage. Otherwise, allowing a party to refuse to abide by terms upon which it agreed would foster discord and distrust. Thus, the city was required to abide by the CBA's grievance procedures.