Funding: The project Crowdsourcing is funded by Deutsche Forschungsgemeinschaft (DFG) in the subject area "Operating, Communication and Information Systems" since 2014. Research grant holders are Tobias Hoßfeld (University of Duisburg-Essen, Chair of Modeling of Adaptive Systems), Phuoc Tran-Gia (University of Würzburg, Chair of Communication Networks) , Ralf Steinmetz and Christoph Rensing (TU Darmstadt, Multimedia Communications Lab) under grants HO 4770/2-1, TR257/38-1, STE 866/9-1, RE 2593/3-1: "Design and Evaluation of new mechanisms for crowdsourcing as emerging paradigm for the organization of work in the Internet". The original German title of the project is "Design und Bewertung neuer Mechanismen für Crowdsourcing als neue Form der Arbeitsorganisation im Internet".