[SIZE=15px]For my master’s thesis I am interested in which rating scale you use for rating the severity of a usabilty problem when you apply a heuristic evaluation or an expert review. Jakob Nielsen’s four-step scale (0 = "No usability problem at all ", 4 = “Usability catastrophe” ) often seems to be the standard, I am interested in whether that is really true in practice.
Do you use Nielsen’s rating scale? If not, which other approach do you use, and why?[/SIZE]