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In the Operations and Checkout Building, Gregory T. Linteris and Roger K. Crouch, payload specialists, and Janice E. Voss, payload commander, are participating in a systems test of the Microgravity Science Laboratory 1 (MSL-1), a Spacelab facility. Slated originally to fly the STS-83 mission in April 1997 aboard the Space Shuttle Columbia on a 16-day flight, however, the mission was cut short due to fuel cell failure. The MSL-1 represents a bridge between traditional Spacelab flights and the International Space Station (ISS). Research procedures and equipment will be tested on MSL-1 that could become standard on the ISS. In addition, experiments flown on previous Spacelab missions will fly again, and new experiments are also planned.