Aselmaa, AnetSong, YuGoossens, Richard H. M.Tobias Isenberg and Filip Sadlo2016-06-092016-06-092016978-3-03868-015-4-http://dx.doi.org/10.2312/eurp.20161128https://diglib.eg.org:443/handle/10Through the synthesis of gathered user research data, interaction designers are able to generate design proposals. Logging user interactions with a software provides a rich set of data that can give further insights into users' behavior. We present a case study of visualizing interactions log files of the manual tumor contouring task. We identify two types of visualizations needed for comprehending the tumor contouring process. Based on these visualizations, designer was able to gain a holistic view of the process, detailed understanding of the different phases of the task, and identify re-occurring interaction patterns.H.5.2 [Information interfaces and presentation (e.g.HCI)]User InterfacesUsercentered design10.2312/eurp.201611285-7