Following SEIU Local 121RN v. Los Robles Regional Medical Center (9th Cir. 2020) 976 F.3d 849, this decision holds that, at least with respect to delegation of arbitrability questions to the arbitrator, arbitration clauses in collective bargaining agreements are to be interpreted just like arbitration clauses in other types of contracts. A broad arbitration provision in a collective bargaining agreement is not enough to delegate arbitrability questions to the arbitrator; rather, the agreement must clearly and unmistakably delegate those questions to the arbitrator. Also, here the union failed to produce evidence supporting its argument that it had been prior practice under this collective bargaining agreement to let arbitrators decide arbitrability issues. On the merits, the district’s canceling of remedial English classes in response to state legislation was not governed by the agreement and so the union had no right to seek arbitration of its grievance about the cancellation.