More specifically, the Fundamental Attribution Error says that the tendency to overestimate the effect of disposition or personality and underestimate the effect of the situation works when judging other people's behavior; instead, when judging our own behavior, we tend to overestimate the effect of the situation, and underestimate that of our own disposition/personality.

It would be interesting if they could add to the experiment cases where people had to judge themselves - but I guess it would be much more difficult to find a repeatable test for that.