Criticism of the system of Investor-State dispute settlement has led to an attempt to reform the system and to introduce a standing arbitration tribunal along with various other adjustments in the Investment Chapter of the Comprehensive Economic and Trade Agreement (CETA). This standing tribunal is called International Court System (ICS). To successfully establish the ICS the drafters of CETA had to keep in mind the relationship of European and International law and especially the concept of the autonomy of EU law in order for CETA to be adopted. In this thesis the traditional system of international investment arbitration and the newly introduced International Court System is compared. Moreover, the concept of the autonomy of EU law and its implications on international dispute settlement systems will be looked at. Finally, an outlook on the amendments in the investor-state dispute settlement (ISDS) chapter of CETA and whether they were sufficient to be deemed compatible with the EU treaties by the Court of Justice of the European Union (CJEU) will be made.