This Practice Note considers the procedure of an arbitration under the under the International Centre for Dispute Resolution (ICDR) International Dispute resolution Procedures (including Mediation and Arbitration Rules) (the International Rules), amended and effective 1 March 2021. For an introduction to the International Rules, including how to commence and respond to ICDR arbitration proceedings, see Practice Note: ICDR (2021)—introduction to the institution—commencing arbitration and responding to arbitration. For guidance on arbitrating under previous editions of the International Rules, see: ICDR arbitration—overview. For guidance on the American Arbitration Association® (AAA), see: AAA arbitration—overview. Pleadings The only pleadings expressly contemplated by the International Rules are the Notice of Arbitration, Answer to the Notice of Arbitration, and any counterclaim and answer to counterclaim. The International Rules also allow parties to amend or supplement their claims, counterclaims or defences unless the tribunal considers it inappropriate, based on factors such as the party’s delay (ICDR, art 10). As a matter of practice,