Two teachers and assignments....

It is not uncommon for two teachers to split a course with the same students.

I.e. a colleague and I teach different aspects of the same A-Level course. 

With assignments, I don't need to see their assignments and they don't need to see mine. It's clutter. The kids needs to see them all! Each of us *should* be able to see them if we wish.

I don't need to see the details of what my colleague assigns, most of the time. On occasion, and assignment will 'span' both sides of the course (e.g. project work) and for these assignments both of us would want to see the assignment.

Simplest thing:

Each assignment has a 'set by' with options 'Mrs X, Mr Y, Both teachers'

As a teacher, in the assignment view, my default would be 'Me or Both' (though I should be able to select 'All' for an over-view.

Same options would be applied to the gradesheet.