Why would a great worker have a low star rating?
Sometimes a worker may have good reviews, but a low star rating.
This could be due to a lack of seniority, arriving late to shifts, not showing up to shifts or "bailing out."
Potentially damaging are bailouts, but it depends on the context in which it happens.
If a worker signs up for a shift two weeks ahead, but soon realizes that they have made a prior personal commitment on that day and "bailout," Schedulehead will not penalize them.
If a worker bails out one hour before the shift, it will penalize them heavily.
How much damage a bailout will do to a workers rating is dependent on how much damage it does to your shift.
None of this damage is permanent and a worker can always improve his or her star rating by improving their performance and reliability.