C. Schumacher, N. Reich-Stiebert, J. Kuzilek, M. Burchart, J. Raimann, J.-B. Voltmer, and S. Stürmer. Group perceptions vs. group reality: Exploring the fit of self-report and log file data in the process of collaboration. Poster presented at the Conference on Learning Analytics and Knowledge, Virtual Conference, 15-04-2021, April 2021.