The International Multisensory Structured
Language Education Council

What is Dyslexia?

Definition of Dyslexia

"Dyslexia is a specific learning disability that is neurobiological in origin. It is characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities. These difficulties typically result from a deficit in the phonological component of language that is often unexpected in relation to other cognitive abilities and the provision of effective classroom instruction. Secondary consequences may include problems in reading comprehension and reduced reading experience that can impede growth of vocabulary and background knowledge."

Adopted by the IDA Board of Directors, Nov. 12, 2002. This Definition is also used by the National Institute of Child Health and Human Development (NICHD).

Course Content

Principles of Instruction

Adapted from "Clinical Studies of Multisensory Structured Language Education for Students with Dyslexia and Related Disorders" published by the International Multisensory Structured Language Education Council and distributed by The International Dyslexia Association.

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