Children complete quizzes on books to assess their understanding, but can also vote for books in terms of whether they enjoyed the book or not. Of course, degree of understanding is not the same as personal preference, and the two measures should not be confused.

The ratings are used to generate an Average Book Rating, which is then weighted taking into account issues such as a minimum number of votes, the overall number of votes cast for a particular book, and the context of ratings in that particular Year.