They disagree on definition e.g. discrepancy def, vary in degree of whata is happening where in the brain, which process is affected and how important it is e.g. phonological processing or visual processing, what the subtypes of dyslexia are,if they exist and whether they are stable, the degree that the difference model is correct and dyslexic students have superior skills in other areas, and lastly, whether it affects males more or not.