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Definition

Dyslexia can be described as a continuum of difficulties in learning to read, write and/or spell, which persist despite the provision of appropriate learning opportunities. These difficulties often do not reflect an individual's cognitive abilities and may not be typical of performance in other areas.
The impact of dyslexia as a barrier to learning varies in degree according to the learning and teaching environment, as there are often associated difficulties such as:
· auditory and/or visual processing of language-based information
· phonological awareness
· oral language skills and reading fluency
· short-term and working memory
· sequencing and directionality
· number skills
· organisational ability
 
Motor skills and co-ordination may also be affected.
(This definition comes from the online resource Assessing Dyslexia Toolkit)