“…The design of this instrument was informed by Triple Word Form Theory (Richards, Aylward, Field, et al, 2006), and internal reliability results have ranged from .78 to .94 (Daffern et al, 2015). Predictive validity was evidenced in a subsequent study examining relationships between the Phonological, Orthographic and Morphological Subscales of the CoST and the NAPLAN Spelling Test (Daffern, Mackenzie, & Hemmings, 2017). The CoST utilises a spelling error analysis technique in order to determine the phonological, orthographic and morphological skills displayed.…”