Original ArticlesPersonalized AAC Intervention to Increase Participation and Communication for a Young Adult With Down SyndromeBabb, Salena; Jung, Sojung; Ousley, Ciara; McNaughton, David; Light, JaniceAuthor Information Departments of Educational Psychology, Counseling, and Special Education (Drs Babb and McNaughton and Mss Jung and Ousley) and Communication Sciences and Disorders (Dr Light), The Pennsylvania State University, University Park. Corresponding Author: Salena Babb, PhD, Department of Educational Psychology, Counseling, and Special Education, The Pennsylvania State University, 125 Cedar Bldg, University Park, PA 16802 ([email protected]). The contents of this paper were developed under grants from the National Institute on Disability, Independent Living, and Rehabilitation Research (NIDILRR grants numbers 90RE5017 and 90REGE0014). The NIDILRR is a center within the Administration for Community Living (ACL), Department of Health & Human Services (HHS). The contents of this paper do not necessarily represent the policy of NIDILRR, ACL, and HHS, and you should not assume endorsement by the Federal Government. Salena Babb was supported by the Penn State AAC Leadership Project, a doctoral training grant funded by US Department of Education grant number H325D170024. The reported case studies were not preregistered, and data and research materials have not been placed in an institutional registry. Author disclosures can be found at http://links.lww.com/TLD/A75. Topics in Language Disorders: July/September 2021 - Volume 41 - Issue 3 - p 232-248 doi: 10.1097/TLD.0000000000000240 Buy Metrics Abstract Many adults with Down syndrome (DS) experience difficulty with speech production, and intelligibility challenges and communication breakdowns are common. Augmentative and alternative communication (AAC) intervention can provide important supports for persons with these complex communication needs but must be customized to address the goals, strengths, and needs of the individual. This article provides a description of a personalized AAC intervention for a young adult with DS whose speech was frequently unintelligible. The AAC intervention made use of a video visual scene display (VSD) approach and was investigated in 2 separate studies in 2 key community settings: An inclusive post–secondary education program (a single-case reversal ABAB design), and a community shopping activity (a nonexperimental AB case study design). The participant demonstrated sharp increases in successful communication and participation in both settings following the introduction of the video VSD, and both the participant and the key stakeholders viewed the intervention positively. The results provide preliminary evidence that personalized AAC intervention, including the use of a video VSD approach, can provide important supports for communication and participation in community settings for adults with DS and complex communication needs. © 2021 Wolters Kluwer Health, Inc. All rights reserved.