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2. Systems engineering—System life cycle processes, ISO/IEC 15288, International Organization for Standardization, 1 November 2002.
3. Ariane 5 Flight 501 Failure Report by the Inquiry Board, European Space Agency, 19 July 1996.
4. The Hubble Space Telescope Optical Systems Failure Report, National Aeronautics and Space Administration, November 1990.
5. Mars Observer Mission Failure Investigation Board Report, National Aeronautics and Space Administration, 31 December 1993.