Programming staff, library administrators, and LIS instructors will find this an easy-to-read handbook for understanding the needs of adults with developmental disabilities and the principles that undergird the best practices the authors describe. Public libraries everywhere have embraced inclusion and expanded their programming for youth with disabilities, especially autism. It's imperative that libraries also offer rich and age-appropriate initiatives for adults with developmental disabilities; after all, as youth now served by their libraries grow up and reach adulthood, they will continue to want and expect libraries to be responsive to their needs. Klipper and Banks, two librarians with a long-standing focus on inclusivity, combine research-based theory and an introduction to best practices with details on how to replicate field-tested programs for adults with developmental disabilities (DD). Readers will learn key ideas about DD, such as an examination and debunking of commonly held stereotypes and misconceptions about people with DD and the role ableism plays in perpetuating them; be introduced to self-advocates and their ways of viewing DD, including terminology and the Neurodiversity movement; get pointers on how to create a culture of inclusion at the library, with discussions of Universal Design and UDL, staff training, and anticipating the unexpected; explore the needs of adults with DD who are also LGBTQA , people of color, immigrants and English language learners, seniors, those with dual diagnoses, and other aspects of intersectionality in library programming; understand how to build on and modify existing children's and YA practice to ensure that library users with DD receive age-appropriate and respectful library service; learn how to make virtual programming accessible and which programs can be successfully brought online; discover a myriad of programs ready to adapt for their own libraries, such as Sensory Storytime for adults, book clubs, arts and crafts programs, adaptive gaming, job skills workshops, cooking programs, and many more; see how programming for adults with DD works in academic libraries; and gain skills for outreach and keeping current, with guidance on forming and strengthening partnerships, advocacy, fundraising, marketing, and additional resources for deepening knowledge of DD.