With supervisor login it would be nice to see a calendar for the Dept as a whole, to indicate vacation time has been requested on specified dates. Then allow with a click on that date to see who has already requested vacation time off. This will allow supervisor to be more efficient in allowing time off, opposed to clicking the calendar for each employee within a dept before being able to allow vacation time off. This will prevent allowing multiple employees off at the same time and creating a shortage of staff later.