This Guide to ICSID Arbitration, first published in 2004, was written by three leading ICSID arbitration practitioners in the eminent international law firm of Freshfields Bruckhaus Deringer to fill the gap in the literature between generic descriptions and detailed academic commentary. This second edition of the Guide takes account of the scores of ICSID awards and decisions rendered since 2004, as well as significant amendments to ICSID rules and practices. It provides a sufficiently detailed but still ‘user-friendly’ understanding of what ICSID arbitration is, when and how it can and should be used, and how an ICSID case works from start to finish. It offers potential and non-expert users of the ICSID regime - as well as those generally interested in investment treaty arbitration - the essentials of the ICSID Convention and of BITs and MITs, the various sets of rules, ICSID procedure, and the now considerable body of ICSID jurisprudence.