E. Boder and S. Jarrico have developed a test designed to measure the cognitive deficits underlying reading disabilities, which they claim will identify two basic reader subtypes: those with deficits in auditory-linguistic processing skills (dysphonetic) and those with the inability to process visual-spatial information (dyseidetic). To examine the validity of the measure, 28 reading disabled and 20 average readers between 7 and 13 years of age completed Boder and Jarrico measures that gauged visual-spatial ability and knowledge of letter-sound correspondence and two other measures of the same functions. Regression analysis was used to determine the pattern of relationships between performance on the Boder and Jarrico test and on the other two measures. Results indicated that the Boder and Jarrico test should be used with caution. While the measure was sensitive to auditory-linguistic processing, it was not to visual-spatial processing, and thus provided information on only one type of disabled reader. In addition, the age related increase in subjects' production of phonetic spellings suggested that older readers would tend to be classified as dyseidetic, while younger subjects would be classified as dysphonetic. (FL)