by ben reynolds.
Hi Susan,
What we do for this is use the non-editing teacher role. We take away the capability to see all groups for teachers and keep it intact for non-editing teacher. You can even rename the role to Big Cheese.
The virtue is that the Big Cheese can't mess stuff up like a teacher can. Of course, if you're the only teacher, you want to preserve your capability for the teacher role.
You will probably find that you need to put your three groups into three groupings so they can't see each other in Assignment and such.