The thesis focuses on the difficulties of determining the applicable law in interim proceedings in cross-border arbitral proceedings. First, it examines whether arbitral tribunals have a lex arbitri. Subsequently, the various possibilities of interim measures are described and the question is discussed whether arbitral tribunals have to refer to the Rome I Regulation or Section 1051 of the German Code of Civil Procedure in order to determine the applicable conflict of laws for contractual obligations. Then, it is analysed how the applicable substantive law is to be determined or how to proceed in case of non-determinability of such. Finally, the consequences of the application of a substitute law for the main proceedings are discussed.
