To elaborate on a few comments, first myTime (Target's scheduling system) will automatically generate a completely useless schedule. From what I can tell it takes some key lessons about writing a good schedule and completely subverts them. Our myTime generated schedules have produced such hilarity as having 4 cashiers by 9 AM and no closers, or having the closing sales floor team leave 30-60 minutes before the store closes.
Sidebar: it does this because much of the data it's based on is guest traffic. There are practically no guests in the store an hour before close, so myTime reasons that we need practically no team members at that time. What it doesn't take into account, however, is tasks! You need closers to zone a store, but myTime only sees in terms of guests. You need some early shifts to set sales planners on heavy weeks, but again, myTime only sees guests. Even in this regard, however, it is a huge failure as left to its own devices it will consistently fail to predict even simple guest traffic patterns, like the fact that you need more mid cashiers than openers on a Saturday.
Next, the TL or ETL for their department (or an HRTM/ETL-HR) will delete the myTime generated schedule and write a schedule that makes sense for their departments. They will consider the workload for that day or week, and the best shifts to accomplish it (while balancing that with the everyday needs caused by guest traffic - helping guests, strays, zone, etc.) They will ensure the schedules are fair and consistent, like not having many (if any) clopenings and giving TMs a fair mix of shifts. Among other things.
Apologies if this post is coming across as snarky, but I firmly believe that some workcenters' and stores' biggest problems are their schedules, and most of them don't even realize it. A schedule written by a leader familiar with the workcenter, store and market will always be better than a one-size-fits-all computer generated one, at least in its current implementation. Sure it takes a while to learn, but it becomes much quicker once you get the hang of things, and the results are so worth it.