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Successful human-robot (HR) teams working with direct interaction and close coupling will have relationships that vary, depending on whether or not collaboration is prioritized and how collaboration changes the human mental workload and the team’s task performance. Modeling of representative functions can provide predictions of changes in mental workload and the potential impact on team performance. The presented research focuses on modeling and quantifying mental workload for HR teams in which team members have some individually assigned responsibilities but must also make joint decisions with a teammate. IMPRINT Pro, a discrete event simulation modeling tool created by the US Army Research Laboratory, was used to model human-human (HH) and HR teams completing a reconnaissance task in a building. This research evaluated HH and HR teams completing the same reconnaissance tasks …