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In the Fall of 1998, these authors redesigned a component of CTAS, an air traffic control system developed by NASA and now deployed in several US airports. This case study demonstrates how basic software engineering techniques can make a complex system dramatically simpler. The authors describe lessons learned from reverse-engineering an air traffic control system with a variety of tools and redesigning it to be smaller, simpler, and more flexible.

J. Chapin and D. Jackson, "Redesigning Air Traffic Control: An Exercise in Software Design," in IEEE Software, vol. 17, no. , pp. 63-70, 2000.
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