Dyslexia is a difficulty in the acquisition of literacy skills that is neurological in origin. It is
evident when accurate and fluent word reading, spelling and writing develops very
incompletely or with great difficulty. It may be caused by a combination of phonological,
auditory, visual and working memory processing deficits. Word retrieval, speed, morphological
and syntactic processing difficulties may also be present. This does not negate the existence of
comorbid1 difficulties, including receptive and expressive oral language deficits,