ONIX Code Lists Issue 27, October 2014
List 32: Complexity scheme identifier code

Value Description Notes

01 Lexile code For example AD or HL. DEPRECATED in ONIX 3 – use code 06 instead.
02 Lexile number For example 880L. DEPRECATED in ONIX 3 – use code 06 instead.
03 Fry Readability score Fry readability metric based on number of sentences and syllables per 100 words. Expressed as a number from 1 to 15 in <ComplexityCode>.
04 IoE Book Band UK Institute of Education Book Bands for Guided Reading scheme (see http://www.ioe.ac.uk/research/4664.html). <ComplexityCode> is a colour, eg ‘Pink A’ or ‘Copper’.
05 Fountas and Pinnell Text Level Gradient <ComplexityCode> is a code from ‘A’ to Z+’.
06 Lexile measure The Lexile measure in <ComplexityCode> combines the Lexile number (for example 620L or 880L) and optionally the Lexile code (for example AD or HL). Examples might be ‘880L’, ‘AD0L’ or ‘HL600L’.
07 ATOS for Books Advantage-TASA Open Standard book readability score, used for example within the Accelerated Reader scheme. <ComplexityCode> is a real number between 0 and 17.
08 Flesch-Kincaid Grade Level Flesch-Kincaid Grade Level Formula, a standard readability measure based on the weighted number of syllables per word and words per sentence. <ComplexityCode> is a real number between about -1 and 20.