This session focuses on best practices from the AVIxD Design Guidelines Working Group on natural language understanding (NLU) technologies and their role in VUI design. What are NLU technologies? What information is available in the scientific literature to guide VUI design decisions when using NLU? What VUI design practices are associated with successful use of NLU technologies? The session, led by a member of the AVIxD guidelines team, encourages significant audience participation in the discussion.