How are zApp and Book ratings calculated?

zApps are judged on their overall useability by two 5-star rating systems.

The first is the student rating, which is an average of the ratings awarded to the zApp by a student upon their completion of the zApp.

The second is the teacher rating, which is an average of the ratings awarded to the zApp by a teacher either upon completion of the zApp or at any other time providing the zApp is in their personal library.

Teachers can also leave a rating and written review of any zApp Book providing the zApp Book is in their personal library.