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This report takes a comprehensive look at the ability to determine aptitude for Extravehicular Activity (EVA) of an Astronaut via an evaluation criterion. A detailed history of the EVA Skills Program and the ability to quantify EVA skills within the NASA community is presented as well as the explanation of how the program evolution was inevitable for ISS survival. It describes how the evaluation utilized within the Skills Program has become the EVA standard for instructing and evaluating the ability to perform an EVA. This report will identify the logical steps taken to emulate a real EVA. It will identify how these steps of performing an EVA tie into the evaluation process of the skills program. It will identify areas of concerns that need to be taken into consideration when utilizing this criterion.

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.