This chapter explains how arbitration works in practice. Arbitration takes place if and only if parties have consented to it. Their consent needs to make clear how, specifically, arbitration is going to work for them. Parties in some situations may use courts and through them the executive apparatus to assist in arbitral proceedings. Under most arbitration agreements, once the arbitrator or arbitral tribunal has given the final arbitral award, arbitral jurisdiction comes to an end, and so there is no place for a party to turn to appeal against an adverse award. However, a losing party nevertheless may have opportunities to challenge an award, including in proceedings in national courts.