Austrian Yearbook on International Arbitration is a collection of articles on current issues and hot topics in arbitration. It provides a comprehensive overview of recent developments in the field.The present 20th anniversary edition contains 39 contributions from altogether 65 leading practitioners and academics. It features “The Vienna Propositions on Efficiency in Arbitration” which summarize the discussions held at the VAD World Café in 2025,forward looking keynote speeches by Cavinder Bull SC, Professor Stavros Brekoulakis and Roland Ziadé, andarticles addressing efficiency, diversity, technology and AI, procedural issues, enforcements and ISDS. Furthermore, the Yearbook covers specific regional developments, including those in Austria, the Balkans, China, Germany, Hungary, and the United Kingdom as well as a report providing insights into the successful work of VIAC.