Login as a student (A), go and edit your profile and Add idnumber,address,phone,mobile phone,department and institution Login as teacher (Teacher at system level and doesnt have site:viewuseridentity capability) (B) and visit student A's profile (profile.php not course profile) and make sure you cannot see any of these fields. Now login as admin and give B the capability site:viewuseridentity Search for setting showuseridentity and check a few fields log back as user B and go to A's profile and make sure you can see the fields that you checked in step above.