You hire someone full time (37.5hrs) to do a job which has always taken previous employees 37.5hrs to do.
New employee changes processes/way of working and the job gets done in a quarter of the time and to a higher standard (we can measure the metrics). Employee then requests other work to do as now under employed.
However, other employees are not happy to hand over their responsibilities as its part of their job role. When employee went on annual leave colleague covered their job role. Even accounting for new process put in place they couldn't do it in the same amount of time as new employee can.
We now have the problem of a) this job only takes a portion of the time so job role is changed to reflect that, employee leaves as needs full time hours and job cannot be done by someone else in that time. b) find other work/projects for employee to do, however other staff reluctant to hand over their responsibilities to someone else. c) Tell employee they are under employed and maybe would want to seek work elsewhere (we have no promotions coming up)
Employee was given a project to do, delivered 3 days before deadline to a v high standard.
I am at a loss as to what to do with this person (disclaimer I am not the line manager, but a line manager across and up from her iyswim!)