320 adults rated 48 counterproductive workplace behaviors (CWBs) on a 9-point scale, from petty to serious offense, and also completed the Just World Beliefs scale. Ratings of the seriousness of the CWBs indicated considerable variability in perceptions, with theft and physical violence rated most strongly. A factor analysis yielded five interpretable factors. Older participants were more likely to rate as more serious all counterproductive workplace behaviors.