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Extravehicular activity (EVA) work efficiency is defined as a means to evaluate the on-orbit performance of the International Space Station (ISS) EVA support equipment system, worksite characteristics and basic layout of ISS for EVA maintenance. To facilitate a better understanding of the time and task data presented a brief explanation of the ISS EVA maintenance concept of operations and support equipment is system provided. Data from an ISS spacewalk is presented to calculate a task time distribution for that specific EVA. Analog data from two terrestrial based activities is presented to provide a comparison of different efficiencies. Conclusions are provided as to the effectiveness and efficiency of the ISS EVA task design and the future application of EVA task and tool related work efficiency parameters to the design of task related systems for exploration.