1 Studies included in the meta-analysis (total number of studies in parentheses) Augmented Input (1) Dexter, M. E. (1998). The effects of aided language stimulation upon verbal output and augmentative communication during storybook reading for children with pervasive developmental disabilities. Unpublished doctoral dissertation, The Johns Hopkins University, Baltimore. Gestures (2) Buffington, D. M., Krantz, P. J., McClannahan, L. E., & Poulson, C. L. (1998). Procedures for teaching appropriate gestural communication skills to children with autism. Journal of Autism and Developmental Disorders, 28(6), 535-545. Carr, E. G., & Kemp, D. C. (1989). Functional equivalence of autistic leading and communicative pointing: Analysis and treatment. Journal of Autism and Developmental Disorders, 19, 561-578. Graphic Symbols (11) Hamilton, B. L., & Snell, M. E. (1993). Using the milieu approach to increase spontaneous communication book use across environments by an adolescent with autism. Augmentative and Alternative Communication, 9, 259-272. Johnston, S., Nelson, C., Evans, J., & Palazolo, K. (2003). The use of visual supports in teaching young children with autism spectrum disorder to initiate interactions. Augmentative and Alternative Communication, 19, 86-103. Kozleski, E. B. (1991). Visual symbol acquisition by students with autism. Exceptionality, 2, 173-194. Reichle, J., & Brown, L. (1986). Teaching the use of a miltipage direct selection communication board to an adult with autism. Journal of the Association for Persons with Severe Handicaps, 11, 68-73. Reichle, J., McComas, J., Dahl, N., Solberg, G., Pierce, S., & Smith, D. (2005). Teaching an individual with severe intellectual delay to request assistance conditionally. Educational Psychology, 25(2/3), 275-286. Reichle, J., Sigafoos, J., & Remington, B. (1991). Beginning an augmentative communication system with individuals who have severe disabilities. In B. Remington (Ed.), The Challenge of Severe Mental Handicap: A Behavior Analytic Approach. (pp. 189-213). New York: Wiley. Sigafoos, J. (1998). Assessing conditional use of graphic mode requesting in a young boy with autism. Journal of Developmental and Physical Disabilities, 10, 133151. Sigafoos, J., Laurie, S., & Pennell, D. (1996). Teaching children with Rett syndrome to request preferred objects using aided communication: Two preliminary studies. Augmentative and Alternative Communication, 12, 88-96. Spillane, M. M. (1999). The effect of instructional method on symbol acquisition by students with severe disabilities. Unpublished doctoral dissertation, The University of Nebraska, Lincoln. Stiebel, D. (1999). Promoting augmentative communication during daily routines. Journal of Positive Behavior Interventions, 1(3), 159-169. Van Acker, R., & Grant, S. H. (1995). An effective computer-based requesting system for persons with Rett syndrome. Journal of Childhood Communication Disorders, 16(2), 31-38. 2 Manual Signs (12) Barrera, R. D., Lobato-Barrera, D., & Sulzer-Azaroff, B. (1980). A simultaneous treatment comparison of three expressive language training programs with a mute autistic child. Journal of Autism and Developmental Disorders, 10, 2137. Brady, D. O., & Smouse, A. D. (1978). A simultaneous comparison of three methods for language training with an autistic child: An experimental single case analysis. Journal of Autism and Childhood Schizophrenia, 8, 271-279. Carr, E. G., Binkoff, J. A., Kologinsky, E., & Eddy, M. (1978). Acquisition of sign language by autistic children. I: Expressive labeling. Journal of Applied Behavior Analysis, 11, 489-501. Carr, E. G., & Dores, P. A. (1981). Patterns of language acquisition following simultaneous communication with autistic children. Analysis and Intervention in Developmental Disabilities, 1, 347-361. Carr, E. G., & Kologinsky, E. (1983). Acquisition of sign language by autistic children II: Spontaneity and generalization effects. Journal of Applied Behavior Analysis, 16, 297-314. Carr, E. G., Kologinsky, E., & Leff-Simon, S. (1987). Acquisition of sign language by autistic children. III: Generalized descriptive phrases. Journal of Autism and Developmental Disabilities, 17, 217-229. Hundert, J. (1981). Stimulus generalization after training an autistic deaf boy in manual signs. Education and Treatment of Children, 4(4), 329-337. Keogh, D., Whitman, T., Beeman, D., Halligan, K., & Starzynski, T. (1987). Teaching interactive signing in a dialogue situation to mentally retarded individuals. Research in Developmental Disabilities, 8, 39-53. Remington, B., & Clarke, S. (1983). Acquisition of expressive signing by autistic children: An evaluation of the relative effects of simultaneous communication and sign-alone training. Journal of Applied Behavior Analysis, 16, 315-328. Saraydarian, K. A. (1994). Simultaneous referent recognition-production training for nonverbal children with autism. Unpublished doctoral dissertation, Columbia University Teachers College, New York, New York. Schepis, M. M., Reid, D. H., Fitzgerald, J. R., Faw, G. D., VanDenPol, R. A., Welty, P. A. (1982). A program for increasing manual signing by autistic and profoundly retarded youth within the daily environment. Journal of Applied Behavior Analysis, 15, 363-379. Sommer, K. S., Whitman, T. L., & Keogh, D. A. (1988). Teaching severely retarded persons to sign interactively through the use of a behavioral script. Research in Developmental Disabilities, 9, 291-304. Photographic Activity Schedules (1) Spencer, L. G. (2002). Comparing the effectiveness of static pictures vs. video modeling on teaching requesting skills to elementary children with autism. Unpublished doctoral dissertation, Georgia State University, Atlanta. Picture Exchange Communication System (7) Anderson, A. E. (2001). Augmentative communication and autism: A comparison of sign language and the Picture Exchange Communication System. Unpublished doctoral dissertation, University of California, San Diego. 3 Charlop, M. H., Carpenter, M., Le, L., LeBlanc, L.A., & Kellet, K. (2002). Using the picture exchange communication system (PECS) with children with autism: Assessment of PECS acquisition, speech, social-communicative behavior, and problem behavior. Journal of Applied Behavior Analysis, 35, 213-231. Frea, W. D., Arnold, C. L., & Vittimberga, G. L. (2001). A demonstration of the effects of augmentative communication on the extreme aggressive behavior of a child with autism within an integrated preschool setting. Journal of Positive Behavior Interventions, 3(4), 194-198. Jones, C. M. (2004). Using the picture exchange communication system and time delay to enhance the spontaneous speech of children with autism. Unpublished doctoral dissertation, Claremont Graduation University, California. Kravits, T. R., Kamps, D. M., Kemmerer, K., & Potucek, J. (2002). Brief report: Increasing communication skills for an elementary-aged student with autism using the picture exchange communication system. Journal of Autism and Developmental Disorders, 32, 225-230. Marckel, J. M., Neef, N. A., & Ferreri, S. J. (2006). A preliminary analysis of teaching improvisation with the picture exchange communication system to children with autism. Journal of Applied Behavior Analysis, 39, 109-115. Tincani, M. (2004). Comparing the picture exchange communication system (PECS) and sign-language training for children with autism. Focus on Autism and Other Developmental Disabilities, 19(2), 152-163. Speech-Generating Devices (8) Dyches, T. T. (1998). Effects of switch training on the communication of children with autism and severe disabilities. Focus on Autism and other Developmental Disabilities, 13(3), 151-162. Parsons, C. L., & La Sorte, D. (1993). The effect of computers with synthesized speech and no speech on the spontaneous communication of children with autism. Australian Journal of Human Communication Disorders, 21, 12-31. Schepis, M. M., Reid, D. H., Behrmann, M. M., & Sutton, K. A. (1998). Increasing communicative interactions of young children with autism using a voice output communication aid and naturalistic teaching. Journal of Applied Behavior Analysis, 31, 561-578. Schlosser, R. W., & Blischak, D. M. (2004). Effects of speech and print feedback on spelling by children with autism. Journal of Speech, Language, and Hearing Research, 47, 848-862. Schlosser, R. W., Blischak, D. M., Belfiore, P. J., Bartley, C., & Barnett, N. (1998). Effects of synthetic speech output and orthographic feedback on spelling in a student with Autism: A preliminary study. Journal of Autism and Developmental Disorders, 28, 309-319. Sigafoos, J., Didden, R., & O’Reilly, M. (2003). Effects of speech output on maintenance of requesting and frequency of vocalizations in three children with developmental disabilities. Augmentative and Alternative Communication, 19(1), 37-47. Sigafoos, J., Drasgow, E., Halle, J. W., O’Reilly, M., Seely-York, S., Edrisinha, C., et al. (2004). Teaching VOCA use as a communicative repair strategy. Journal of Autism and Developmental Disorders, 34(4), 411-422. Son, S. H. (2005). Comparing two modes of AAC intervention for children with autism. Unpublished doctoral dissertation, The University of Texas at Austin. 4 Teaching Orthographic Symbols (1) Hetzroni, O. E., & Shalem, U. (2005). From logos to orthographic symbols: A multilevel fading computer program for teaching nonverbal children with autism. Focus on Autism and Other Developmental Disabilities, 20(4), 201212. Visual Supports (1) Dettmer, S., Simpson, R. L., Myles, B. S., & Ganz, J. B. (2000). The use of visual supports to facilitate transitions of students with autism. Focus on Autism and Developmental Disabilities, 15, 163-169. Recent studies not evaluated yet: Bock, S. J., Stoner, J. B., Beck, A. R., Hanley, L., & Prochnow, J. (2005). Increasing functional communication in non-speaking preschool children: Comparison of PECS and VOCA. Education and Training in Developmental Disabilities, 40(3), 264-278. Ferrara, S. M. (2006). Voice output communication aids or Picture Communication System: The efficient way for individuals with severe disabilities to acquire communication. Unpublished master’s thesis, California State University, Fullerton. Lancioni, G. E., O’Reilly, M. F., Cuvo, A. J., Singh, N. N., Sigafoos, J., & Didden, R. (in press). PECS and VOCAs to enable students with developmental disabilities to make requests: An overview of the literature. Research in Developmental Disabilities. Schlosser, R. W., Sigafoos, J., Luiselli, J. K., Angermeier, K., Harasymowyz, U., Schooley, K., et al. (in press). Effects of synthetic speech output on requesting and natural speech production in children with autism: A preliminary study. Research in Autism Spectrum Disorders. Schwartz, J. B., & Nye, C. (2006). Improving communication for children with autism: Does sign language work? EBP Briefs, 1(2), 1-17. Sidener, T. M., Shabani, D. B., Carr, J. E., & Roland, J. P. (2006). An evaluation of strategies to maintain mands at practical levels. Research in Developmental Disabilites, 27, 632-644. Sigafoos, J., Ganz, J. B., O’Reilly, M. F., Lancioni, G. E., & Schlosser, R. W. (2007). Assessing correspondence following acquisition of an exchange-based communication system. Research in Developmental Disabilities, 28, 71-83. Stoner, J. B., Beck, A. R., Bock, S. J., Hickey, K., Kosuwan, K., & Thompson, J. R. (2006). The effectiveness of the Picture Exchange Communication System with nonspeaking adults. Remedial and Special Education, 27(3), 154-163. Yoder, P., & Stone, W. L. (2006). A randomized comparison of the effect of two prelinguistic communication interventions on the acquisition of spoken communication in preschoolers with ASD. Journal of Speech, Language, and Hearing Research, 49, 698-711. Yoder, P., & Stone, W. L. (2006). Randomized comparison of two communication interventions for preschoolers with Autism Spectrum Disorders. Journal of Consulting and Clinical Psychology, 74(3), 426-435. Yokoyama, K., Naoi, N., & Yamamoto, J. (2006). Teaching verbal behavior using the Picture Exchange Communication System (PECS) with children with Autistic Spectrum Disorders. Japanese Journal of Special Education, 43(6), 485-503.