... the problem, and the many different ways in which it manifests itself, it is impossible to find a definition upon which everyone may agree. Nevertheless, several definitions exist which may serve as a starting point. An early definition by Critchley is that dyslexia is "a disorder of children who, despite conventional classroom experience, fail to attain the language skills of reading, writing and spelling commensurate with their intellectual abilities." This raises two main points: what is 'conventional classroom experience', and how can we prove what level of language skills are 'commensurate with intellectual ability'? This definition was improved upon in 1978 by Critchley and Critchley: "children with specific learning difficulties are those who in the absence of sensory defect or overt organic damage, have an intractable learning problem in one or more of reading, spelling or maths, and who do not respond to normal teaching," (see also, Critchley and Critchley ...

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