When parties choose an arbitration institution, are they free to determine the arbitration rules they apply? This book deals with the extent and limits of party autonomy in institutional international arbitration based on the example of hybrid arbitration agreements. Such agreements allow for arbitration administered by one institution but under the rules of another. In this study, the author analyses the problems that arise from such agreements under arbitration law, contract law, intellectual property law and unfair competition law from a transnational perspective and with regard to different legal systems. Moreover, she compares the rules and actors of leading European, Asian and American arbitration institutions. Practitioners and scholars will find this book to be a valuable guide when dealing with the specifics of institutional arbitration.