Master of Science (M.S.)- Surgery Support System Based on Touchless Control of 3D Anatomical modelIn the operating room, a touchless interface is an ideal solution since it does not demand any physical contact and still can provide the necessary control features in a cleansed and sterilized environment. While surgical practices are increasingly reliant on a range of digital imaging technologies, the ability for clinicians to interact and manipulate these digital representations in the operating theatre using a traditional touch-based interaction device is constrained by the need to maintain sterility. While there have been important technical strides in the area, there has been little in the way of understanding the use of these touchless systems in practice. We present findings from a study of the system in use focusing on how, with touchless interaction, the visual resources were embedded and made meaningful in the collaborative practices of surgery. We discuss the broader implications of these findings for how we think about the design, evaluation and use of these systems.