That is also a big flaw in the study. Personality is very much dependent on context. So they measured disagreeability (1) as part of their extra-credit course w

That is also a big flaw in the study. Personality is very much dependent on context. So they measured disagreeability (1) as part of their extra-credit course work, and (2) as a follow-up. To really get into the work environment, either one has to do ethnographic field work, or make assumptions about disagreeability based on other factors.