I have quite a bit of experience with white-collar employee evaluations, which are rich in vagueness (cf. Dilbert). Innovative contributions, especially quantitative ones, such as improving a software design that reduces development time by 50% may be prized. Sometimes, employees may be encouraged to gain additional skills or certifications, or even a whole degree.
What do employee evaluations look like in manual trades? Would Joe Securityguard be commended for discovering that carrying a 22 caliber pistol rather than the company issued 38 caliber pistol reduced fatigue by 10% but had no measurable effect on stopping intruders?