Assignment ID and standards

[Clay Fenlason]

We're gearing up for some extended work on the assignments tool, and
I'm trying to orient myself by identifying other landmarks in this
area, either assignments in LMSes in particular, or more general
submission-feedback workflows.  Searching is not getting me very far,
as putting "assignment" into a list of search terms always turns up
several hundred bits of student homework before it will get to the
sort of interaction design hints (or open standards) I'm hoping for.
Anyone have any favorites they might point me to?

~Clay