This data set/entry contains and stores the website of the completed Collaborative Research Center (CRC)/Sonderforschungsbereich (SFB) Transregio 15 /“Governance and The Efficiency of Economic System”. It contains (most) of the data on the former webpage (working papers, newsletters, etc.) except for the defunct members area. It can be accessed (again) through www.sfbtr15.de. The CRC/SFB was funded by the German Research Foundation (DFG) between 2004 and 2015 and it was a research cooperation of FU Berlin, HU Berlin, the University of Bonn, the University of Mannheim, ZEW Mannheim and LMU Munich. Prof. Dr. Klaus Schmidt was member of the executive board and spokesperson of the CRC/SFB.