ATOS ZPD (Zone of Proximal Development)
When students have taken a Star Reading, Star Early Literacy, or myON placement test, they are shown the ATOS ZPD alongside the Star Score (unless the Building Administrator turns that score off in the building settings).
The Zone of Proximal Development (ZPD) is a term borrowed from psychologist Lev Vygotsky. In myON, the ZPD is a range of book levels that are not too challenging and not too easy, depending upon a student's reading level. It can help guide students' reading choices (but not limit those choices).
The ZPD is shown in terms of ATOS book levels. These levels indicate how difficult a book is to read.
ZPDs are also used in Accelerated Reader to help students find and select books.