Past Practice

The history of the way parties have behaved toward one another in the past that bears upon the expectations the parties have regarding negotiations in the future. Such practices, sanctioned by use and acceptance, are not specifically included in the collective bargaining agreement. To constitute a past practice the issue must be: 1) clear to the parties; 2) consistent in its application over a period of time; and 3) condoned by the parties. Arbitrators use past practice to interpret ambiguous language in the collective bargaining agreement.