Two methodological problems often arising in dyslexia research are considered. The first problem concerns the validity of experimental measures and the related problem of interpreting null results. The second problem involves the effects of sampling from a disabled population if the disorder under investigation has multiple unknown origins.…

Reactions to H. Lee Swanson's paper "Toward a Metatheory of Learning Disabilities" are outlined, and his arguments are applied to reading disabilities, focusing on the importance of the scientific attitude, the misuse of ecological validity, interpretation of Thomas Kuhn's work, modularity and reading disability, and scientific progress…