Vernon and Brown (1964) reported the tragic case of a young girl who was relegated to a hospital for the mentally retarded as a consequence of the tester’s insensitivity to physical disability. The examiner failed to notice that the child was deaf and concluded that her Stanford-Binet IQ of 29 was valid. She remained in the hospital for five years, but was released after she scored an IQ of 113 on a performance-based intelligence test! After dismissal from the hospital, she entered a school for the deaf and made good progress