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The Woodcock-Johnson III Diagnostic Reading Battery is used to determine application of sound letter knowledge to reading sounds, letters, words, non-words, phrases and sentences.  There are 3 subtests which are used at both the 5 and 9 year old intervals and are as follows:
Letter Word Identification looks at the child’s ability to match, name and recognise letter names and read words.  
Passage Comprehension explores the child’s ability to find meaning behind symbols, pictures and then words and sentences without picture support.
Word Attack demonstrates application of sound-letter knowledge.  Children are required to identify and produce the sound a letter makes and to read aloud non-words using those skills (e.g. ub)