The collected papers in ICCA Congress Series no. 11, as reflected in its title, address important contemporary questions in international commercial arbitration. Included are contributions written by participants in the UNCITRAL Working Group on Arbitration and Conciliation on its current work relating to the requirement of a written form for an arbitration agreement, interim measures of protection and the UNCITRAL's Model Law on International Commercial Conciliation. Further contributions give leading practitioners' views on illegality in the formation and performance of contracts or in the conduct of the arbitration, addressing questions on how the arbitral tribunal should deal with these vexed issues and how forgery and fraud may be detected. The factors that lead to acceptance by parties of the decisions of arbitrators are dealt with in contributions on the psychological aspects of dispute resolution. The volume concludes with a series of articles on arbitration under investment treaties written by experienced arbitrators and practitioners, with special emphasis on ICSID and NAFTA and the emerging issues of transparency, accountability and review.