This closing plenary is designed as an open, interactive discussion. After two and a half days focused on intervention optimization, you may have questions you want to put on the table: places where concepts feel fuzzy, assumptions worth challenging, tensions in the literature. Billie Nahum-Shani will facilitate a group conversation to surface these issues and help shape priorities for future research. A brief summary of the themes that emerge will be posted on interventionoptimization.org.