Re: People with the same job title dont do the same work
Oracle job titles are things like "Individual Contributor level 5"or "Manager level 3"
No idea why you got downvoted for that description of Oracles "lovely" job titles....
However, an individual contributor level 5 might find someone with 5 years experience, 15 years experience, and 25 years experience in the same role. To say they're all doing the same work to the same level is pure fantasy.
Theres a lot of research around job performance, but the two factors which overwhelmingly influence job performance within a role are experience and IQ. Obviously, that's for a given level of drive, because if you're smart and lazy and have been such for a long time, you're quite possibly going to get out performed by someone with a bit more oomph.