Thanks to all of you for attending the joint NSF-MARGINS and IFREE Subduction Factory Studies in the Izu-Bonin-Mariana Arc System: Results and Future Plans Workshop . The Conveners and the MARGINS Office would now like constructive comments concerning the workshop organization, presentations, and venue in order help improve subsequent MARGINS events. Your response will help MARGINS judge how well the workshop fostered its goals — to review our current understanding of the SubFac concepts, to define outstanding problems, and to discuss and plan future experiments and collaborations.