This Practice Note considers the International Bar Association Rules (IBA) on the Taking of Evidence in International Arbitration (also known as the IBA Rules of Evidence or the IBA Rules) which are widely used in international arbitration as the agreed standard which the arbitral tribunal will order the parties to apply when presenting the factual and witness evidence in arbitration. The IBA Rules also set out the extent of documentary disclosure (sometimes referred to as IBA Rules disclosure or IBA Rules discovery; IBA disclosure or IBA discovery) that will take place in arbitrations where the IBA Rules are agreed by the parties to apply. Reference is also made to the Prague Rules (ie the Rules on the Efficient Conduct of Proceedings in International Arbitration).