Orton-Gillingham is an instructional approach intended primarily for use with individuals who have difficulty with reading, spelling, and writing associated with dyslexia. It is most properly understood and practiced as an approach, not a method, program, system or technique. In the hands of a well-trained and experienced instructor, it is a powerful tool of exceptional breadth, depth, and flexibility. This approach is derived from two sources: first from a body of time-tested knowledge and practice that has been validated over the past 70 years, and second from scientific evidence about how individuals learn to read and write.*

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*Resource: Academy of Orton-Gillingham Practitioners and Educators