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The Lunar Electric Rover (LER), which was formerly called the Small Pressurized Rover (SPR), is currently being carried as an integral part of the lunar surface architectures that are under consideration in the Constellation Program.

The main test objective was to collect Unpressurized Rover (UPR) and Lunar Electric Rover (LER) engineering performance and human factors metrics while under extended periods of representative mission-based scenario test operations involving long drive distances, night-time driving, Extravehicular Activity (EVA) operations, and overnight campover periods.

The two tasks were a site survey for lunar outpost (using the Science, Crew, Operations, and Utility Testbed (SCOUT) rover) and deployment of a solar power system with cables. For both of these tasks, the team acquired quantitative data on human-robot interaction that can be used to determine task efficiency indexes to compare the operational scenarios of robots, humans, and human-robot teams.