A new definition from the findings of a Delphi study has now been published. You can access the papers here. The findings of the Delphi study are still being reviewed. Until then, the definition from Sir Jim Rose's 2009 report is used for diagnosing dyslexia.

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The Rose Definition states that:

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• Dyslexia is a learning difficulty that primarily affects the skills involved in accurate and fluent word reading and spelling.

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• Characteristic features of dyslexia are difficulties in phonological awareness, verbal memory and verbal processing speed.

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• Dyslexia occurs across the range of intellectual abilities. It is best thought of as a continuum, not a distinct category, and there are no clear cut-off points.

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• Co-occurring difficulties may be seen in aspects of language, motor co-ordination, mental calculation, concentration and personal organisation, but these are not, by themselves, markers of dyslexia.

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• A good indication of the severity and persistence of dyslexic difficulties can be gained by examining how the individual responds or has responded to well-founded intervention.

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In addition, the British Dyslexia Association (BDA) acknowledges the following;

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• Some individuals can experience visual and auditory processing difficulties with dyslexia.

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• Dyslexic readers can show a combination of abilities and difficulties that affect the learning process.

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• Some also have strengths in other areas, such as design, problem solving, creative skills, interactive skills and oral skills.