This "2018-2019 Interagency Autism Coordinating Committee (IACC) Strategic Plan Update" is the work of the IACC membership that was appointed under the Autism CARES Act of 2014. The Committee agreed that the "2016-2017 IACC Strategic Plan" reflected a comprehensive review of the state of the field and provided a set of 23 new research, services, and policy-related objectives. Together, the Committee hopes that the "2018-2019 IACC Strategic Plan Update" will provide an insightful overview of the recent efforts in autism spectrum disorder (ASD) research, services, and outreach as they relate to the issues and goals described in the "2016-2017 IACC Strategic Plan." The "2018-2019 IACC Strategic Plan Update" includes: (1) a synopsis of presentations and discussions that took place at IACC Full Committee meetings in 2018 and 2019; (2) a recap of the activities of the IACC Working Group focused on improving health outcomes for people on the autism spectrum; (3) a recap of the activities of the IACC Working Group focused on housing issues experienced by people on the autism spectrum and their families; (4) a summary of the "2016 ASD Research Portfolio Analysis Report," which is the first analysis of research activities among federal and private funders as they correspond to the objectives of the "2016-2017 IACC Strategic Plan"; and (5) a synopsis of the "Department of Health and Human Services Report to Congress on Activities Related to Autism Spectrum Disorders and Other Developmental Disabilities Under the Autism Collaboration, Accountability, Research, Education and Support Act (Autism CARES Act) of 2014 (FY 2014-FY 2018)," highlighting recent federal activities related to ASD research and services. [For "2016-2017 Interagency Autism Coordinating Committee Strategic Plan for Autism Spectrum Disorder," see ED589791.]