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A substantial body of research literature concerning the effects of collaborative tools on team performance has been generated, but the research has not considered subjective workload and stress associated with tool usage. The current experiment represents an initial, exploratory attempt to characterize the relationship between usage of collaborative tools, mental workload, and the subjective experience of stress. The NASA-TLX and the DSSQ-S were used to assess the workload and stress experienced by participants completing a simulated team command and control task. Task demands and collaborative tool availability were experimentally manipulated. Analysis of the data revealed that participants experienced increases in stress and workload with high task demands which were alleviated by the availability of collaborative tools under certain conditions. The results of this experiment demonstrate the complex relationships between collaborative technologies, workload, and stress.