A truncated tribunal refers to an arbitration tribunal that is missing one of its originally appointed members. Situations where a tribunal could become truncated include if a member dies, resigns, or fails to attend proceedings. Whether a truncated tribunal can continue to make a valid ruling depends on the applicable arbitration rules or law. International cases have found that a truncated tribunal cannot proceed without authorization from the parties if a member resigns, but may be obligated to continue if a member fails to participate without a valid excuse.