Free ResourcesDialogDesign offers the following free resources on this website:
Instructive and usable professional-level usability test reports from DialogDesign and others.
A number of nontrivial usability exercises from DialogDesign’s courses that can help you assess your own usability skills.
A series of collections of comparable professional usability studies, the results of which DialogDesign has organized and analyzed.
Papers in English about usability evaluations (in particular, CUE studies) authored or coauthored by Rolf Molich, DialogDesign’s owner.