In comparing TC, Oral, Cued Speech, and Hearing students in reading achievement as measured on the SAT, there was no statistical difference in achievement between hearing students and the profoundly deaf users of Cued Speech. Among those with a less-severe loss (85-100 dB), no communication group achieved equivalent to hearing students. These cuers may have received less exposure to Cued Speech.
Wandel, Jean E. (1989) "Use of Internal Speech in Reading by Hearing and Hearing Impaired Students in Oral, Total Communication, and Cued Speech Programs." Doctoral dissertation, Teacher's College, Columbia University, New York.
CS develops, in a deaf child, an internal phonological model of the spoken language that can prime the whole process of reading acquisition.
Alegria, J., Dejean, C., Capouillez, J. M., & Leybaert, J. (1989, May) "Role Played by the Cued Speech in the Identification of Written Words Encountered for the First Time by Deaf Children." Presented at the annual meeting of the Belgian Psychological Society, Louvain-la-Neuve. (Reprinted in the Cued Speech Journal, 4, 1990).