Site Administrators should establish Group Access Labels (GALS) when establishing the credentials on the Edit Access page of their iTunes U (teaching & learning, academic) site. This graphic illustrates where the Instructor and Student GALs are established and associated with their respective credentials on the Edit Access page:
This next graphic illustrates how the GAL is used in conjunction with the creation of an iTunes U course "Drop Box" tab to effect drop box functionality:
This next graphic illustrates how a GAL is used in conjunction with the creation of an iTunes U course "Shared" tab to effect shared file functionality among classmates
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