At every talk I give, I ask teachers, “What are the Bookbanders' criteria for slicing?” Over the last 15 years, not one teacher has been able to tell me. I say,

“But, if you don’t know how they’ve been sliced, how do you explain the system to parents? Aren’t you confused as well?"

I’ve googled every possible search word to find the current criteria for Book Banding. I can find the banding colours alongside lists of books, but no criteria.