In 2008 the Vienna University of Technology operated on a high maintenance system landscape that had grown over the last 40 years. The development of a modern IT strategy and an efficient process support in education, research and administration were no longer possible. After a thorough make-or-buy analysis, the university decided to fundamentally redevelop the legacy systems. As an in-house project the development was characterized by a high degree of customization for the needs of the Vienna University of Technology that no standard software can provide. The integrated information systems for research, education and organization is now called TISS (Vienna University of Technology Information Systems and Services). Within 6 years of development more and more features and processes have been implemented. In 2013 TISS provided over 1,200 features for the end users. The System is available on 365 days a year for approximately 27,000 students and more than 4,500 employees of the Vienna University of Technology. This thesis describes the TISS development from the beginning to 2013. To begin with, the historical background of the system landscape existing in 2008 and the main reasons for the redevelopment are described. A market analysis concerning existing campus management systems shows possible alternatives to an in-house development. A project and program description follows and provides an overview of the structures, activities and approaches applied during the realization of TISS. Additionally, an overview of the developed solutions is given from a functional as well as a technical point of view. The thesis concludes with a summary of the results and findings of the project, an economic analysis and a look into the future.