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The AI controls engineer frowned at the speaker, a young mechanical engineer in charge of the physical design of a state-of-the-art biological water processor (BWP). "That pump doesn''t give me any feedback for speed, so we can''t be sure it''s responding to commands.""It''ll have to do," said a woman at the far end of the conference table. As the manager for the Integrated Water-Recovery System (IWRS), she made the final calls. "The eight-head pump won''t function at the required pressures, and the four heads are electric just too expensive. Can''t you use the tube pressures to know if the pumps are working?"

"Okay," said the manager. "We go with the two heads."The time frame was the winter of 1999, and this exchange was typical of many conversations that the Al controls team from the Automation, Robotics, and Simulation Division (AR&SD) at Johnson Space Center (JSC) would have with the advanced water-recovery personnel as the two groups prepared for a year-long test of a new Integrated Water-Recovery System (iWRS), slated to begin in January 2001. We were building an AI control system scooter for this test that had to handle upward laws of 200 sensors and actuators grouped among 4 water processing subsystems. The control system would run 24 hours a day, 7 days a week, and be completely autonomous. It was an applied AI engineer''s dream, and in the end, we were extremely successful. However, there were events that happened for which we were ill prepared, and we would come away with a much better appreciation for the difficulties involved in controlling long-duration life-support systems.