Interviewers occupy a key position in face-to-face interviews. Their behavior decisively contributes
to the quality of surveys. However, monitoring interviewers in face-to-face surveys is much more
challenging than in telephone surveys. It is often up to the interviewer when they conduct the
interviews and which addresses they work on first. Nevertheless, homogeneous fieldwork, i.e. that
which has a geographically similar processing status, is particularly essential for time- and eventdependent
studies such as election studies. Irregular fieldwork combined with geographical
differences can have substantial impacts on data quality. Using the example of the German
Longitudinal Election Study (GLES), we propose and present a visual strategy by plotting key
indicators of fieldwork onto a geographical map to monitor and optimize the fieldwork in face-toface
interviews. The geographic visualization of fieldwork can be an additional tool not only for
election studies, but also other studies
