Uwe Engel is a Professor emeritus of Sociology at the University of Bremen (Germany). He founded the Social Science Methods Centre of Bremen University and is a founding member of the European Association of Methodology (EAM) and the Bremen International Graduate School of Social Sciences (BIGSSS).Lena Dahlhaus is a lecturer at the Institute of Social Sciences (IFSOL) at the Carl von Ossietzky University of Oldenburg, where she teaches statistics, social research methods and urban sociology to students of sociology and political science.