The court discusses the meaning and effect of the referral of the resolution of disputes to arbitration, including: who can ask for referral and when, whether a party has waived its right to request arbitration, the defense that there was no contract at all; whether there was a condition precedent to the commencement of arbitration (e.g. mediation), stay of proceedings v. compelling arbitration, and national procedural specificities such as remand and removal (US), effect of class action. etc.