STS057-34-029 (21 June-1 July 1993) --- Astronaut Nancy J. Sherlock works on the Electronic Procedures Portion (EPROC) of the Human Factors Assessment (HFA) experiment. Astronaut Brian Duffy works nearby. The computer portion of HFA-EPROC simulated a space station propulsion system task. Sherlock, Duffy and four other astronauts spent almost ten days aboard the Space Shuttle Endeavour for the STS-57 mission.