[jiggy2011]

Hopefully over time the system could also optimise retention, if it can correlate being assigned certain tasks often with quitting. You could also have employees fill out satisfaction surveys and weight efficiency with enjoyment, perhaps better employees could be rewarded with more weight given to enjoyment.

Naturally there's going to be more variance in employee performance on some tasks rather than others. For example being a cashier during a quiet time will have less variance than toilet cleaning. A workaround might be to pay a bonus for good performance on high variance tasks.