Specific reading difficulty is the best known, and best studied, form of specific learning difficulty. This is the condition that many refer to as ‘dyslexia’. We will define specific reading difficulty as a significant, unexplained delay in reading in a child of average, or above average, intelligence. A significant delay is usually defined as a reading level more than two standard deviations below the mean for the child’s age (see Chapter 1, p. 5 for the explanation of this term). Specific reading difficulty is, therefore, a form of specific learning difficulty where reading is the particular learning skill affected. Other forms of specific learning difficulty may also be present, particularly spelling, writing, and spoken language difficulties. It should be noted that the diagnosis of specific reading difficulty is based on the degree of delay in reading, rather than on the particular type of errors that the child makes. Much has been made of certain characteristics of children’s reading, such as difficulty in distinguishing ‘b’ from ‘d’, reluctance to read aloud, a monotonous voice when reading, and a tendency to follow the text with the finger when reading. There is nothing diagnostic about these characteristics. They are seen in many children when they first start learning to read (and some are seen in adults when they learn to read a foreign language). The diagnosis of specific reading difficulty should only be made after a comprehensive assessment of intellectual and reading ability, and an exclusion of other causes of poor reading attainment (see Chapter 2). . . . How common is specific reading difficulty? . . . The best evidence for the existence of specific reading difficulty as an entity is given by the results of a study by Professor Michael Rutter and his colleagues, who tested 9–10-year-olds on the Isle of Wight. They first tested the children to determine their intelligence and reading ability. They then studied all the children whose reading was significantly behind that of their peers and found that these could be divided into two groups: those where the delayed reading could be explained by low intelligence and a second group where the children were of normal intelligence and the reading difficulty could not be explained.