Source : Free On-Line Dictionary of Computing

Semi-Automatic Ground Environment
     
         (SAGE) The computer system of the old US Norad air
        defence system.  SAGE was ground-breaking in many ways, such
        as being one of the first very large software projects and the
        first {real-time} system.
     
        {MIT Lincoln Laboratory} developed SAGE and {MITRE
        Corporation} was responsible for system engineering and
        implementation oversight.
     
        {(http://www.togger.com/)},
        {(http://www.jps.net/ethelen/sage.html)},
        {(http://www.eskimo.com/%7Ewow-ray/sage28.html)}.
     
        [Confirm?  Dates?  Connection with MIT Research Laboratory for
        Electronics?]
     
        (1999-12-16)