Reading Disorder is a developmental disorder. It is characterised by reading achievement (e.g. accuracy, speed and comprehension) being significantly below the standards expected for

Reading Disorder (Dyslexia) is diagnosed when reading achievement (accuracy, speed, comprehension) is significantly below what would be expected based on BOTH chronological age AND measured intelligence (IQ). This discrepancy-based definition ensures that reading difficulties are not simply due to low intelligence or inadequate schooling. Option C (schooling experience) is not part of the diagnostic criteria - the key is the discrepancy between actual reading ability and expected ability given age and cognitive capacity.