Many parents (and some teachers) are often confused about how the assessment ‘bands’ are arrived at and what they actually mean for the students.
An Explanation of Naplan Bands
This excellent slideshow from the Victorian Curriculum and Assessment Authority may help to explain how the bands are arrived at and what the results actually mean.
It is by no means comprehensive but gives teachers and non-teachers alike a deeper understanding of the results.
http://usingassessmentdata.vcaa.vic.edu.au/naplan/tut1_1/mod1.aspx#