Longleaf Services proposes a function that allows team members to be notified when the status of a project changes—For example, “File _____ is available for editing”

I'd think an email alert would be best, as it doesn't require the person to be logged into Editoria to see the notification: An author, for example, wouldn't necessarily bother logging in unless they knew the file was ready for them.

If feasible, development-wise, it would be useful to let the Production Editor decide who (that is, which team member) should get the notifications for a project. There are instances in which one user (generally the PE) performs multiple functions, such as also being the copyeditor, and wouldn't want/need the notification that a file is ready to edit.