What options are available in Oracle to reduce overdue trainings?

Summary:

What are you doing to reduce overdue trainings? What features can be used to remind, cajole, coerce or discipline those who go overdue?

Content (required):

I've been asked to summarize what features of Oracle HCM we can use to help us "chase down" the overdue learners. I know we can make custom alerts that would deliver to learners and managers. I'm not sure if we could escalate alerts to a manager's manager after a certain period of time.

If it is yearly compliance training, would it be possible to tie it to some sort of competency that has to be renewed? Is there a way to get overdue information into a performance appraisal? I'd like to hear about anything you are doing that did work, or that you have tried and did not work. Any best practices would be greatly appreciated.