The volume contains articles based on presentations given at a conference hosted by the Institute for Law and Finance of Goethe University on October 27, 2011. Collective action clauses are an example of the typical dichotomy of financial regulation: While the problems are economic in nature, the solutions need to be implemented by law. The Institute for Law and Finance strives to bring together law and finance in order to foster a better mutual understanding of both disciplines and to improve the regulation of financial markets. Thus, the organizers are particularly pleased that eminent experts from the fields of law and finance agreed to participate in the event and to share their views on and experiences with collective action clauses. The presentations given at the conference have been updated in 2012 to reflect recent developments.