This diploma thesis aims to analyse specific fields of investment law in particular in the scope of the case law of international arbitration courts. The presented thesis describes the judiciary practice of arbitral institutions and its role in the forming of investment law. The thesis consists of four parts. The first part serves as an introduction into the field of investment disputes stating the basic terminology. For the purpose of a better understanding of the issues on hand it is crucial to define the relevant key terms. The second part is a history introduction about the evolution in this field followed by the analysis of the current development in investment law. The third chapter describes the various ways investment disputes can b...