A. Arampatzis, E. Kanoulas, T. Tsikrika, S. Vrochidis, H. Joho, C. Lioma, K. Eickhoff, A. N ev eol, L. Cappellato, and N. Ferro, editors. Experimental IR Meets Multilinguality, Multimodality, and Interaction. Proceedings of the Eleventh International Conference of the CLEF Association (CLEF 2020). Lecture Notes in Computer Science (LNCS) 12260, Springer, Heidelberg, Germany, 22-25 September 2020.