In Mitri v. Arnel Management Co. (2007) 157 Cal.App.4th 1164, the employer's policy expressly required the employee to sign an arbitration agreement, and hence the court rejected the employer's contention that a unilateral contract to arbitrate was created, in the absence of a signed agreement, by the employee's continued employment with notice of the arbitration program. In short, the express language of the arbitration agreement did not permit the inference of an implied-in-fact unilateral contract to arbitrate. (Id. at pp. 1172-1173.)