Workshop on Human-Centered Interactive Multimodal AI Systems (HIMAS) at ACM IUI 2027 We are welcoming you to join a full-day workshop on Human-Centered Interactive Multimodal AI Systems (HIMAS) at ACM IUI 2027<https://iui.acm.org/2027/> in February 2027. As AI models are increasingly able to handle multimodal data, effectively deploying these models in real-world settings requires building interactive systems that bridge the gap between multimodal AI and the users. The workshop aims to bring together researchers from multimedia analytics, human-computer interaction, information visualization, and multimodal AI, alongside domain experts, to identify shared challenges and shape a research agenda for the future of HIMAS. Specifically, we are interested in the following themes: * Integrating multimodal AI with interactive interfaces: Moving beyond text-only chat toward interfaces that combine speech, touch, sketches, gestures, and visualizations to communicate with and steer multimodal AI. * Designing HIMAS for effective human-AI collaboration: Supporting mixed-initiative interaction, shared context, and user agency - so people can inspect, verify, and correct how multimodal systems reason. * Adapting and generalizing HIMAS across domains: Understanding which design and evaluation approaches transfer across application areas — and which must be specialized to the domain. The workshop will be in the mini-conference format with paper presentations, panel discussion, interactive demos, and group discussion. We are soliciting the following: * Position papers: Describe a future vision for HIMAS and articulate open challenges the community should tackle. * Research papers: Provide initial understanding of HIMAS through empirical or conceptual work. * Demos: Show working prototypes of interactive multimodal AI systems in an interactive afternoon session. The submission deadline is November 9, 2026. More information about how to submit the paper and the organization will be on our website: https://himas-workshop.com/ On behalf of all organizers, Marcel Worring