Unit 3 explains how to assess the student's retention of the focus words, apply this knowledge outwards to other words with a similar spelling patterns, add prefixes and suffixes to the focus words and strategies for correcting students' spelling errors in a way that enables them to learn from their mistakes. It includes information on phonological awareness based errors, phonic knowledge based errors, spelling and phonic rule based errors, syntax and morphological based errors, semantic and etymological based errors and the importance of metacognition and memory strategies for learning words with unusual graphemes, silent letters or rule breakers