There are some basics that dictate whether an employee will excel. Fundamentally their job preferences, personality and general mental ability must be congruent with the requirements of the job they are to do.
Are you about to hire a new employee? Or have existing employees you're concerned about? Or just curious about how to go about matching jobs and people?
Slide the sliders and read the accompanying text to define exactly what kind of person you need to excel in a particular role.