Semi-Automatic Ground Environment <project> (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://togger.com/), (http://jps.net/ethelen/sage.html), (http://eskimo.com/%7Ewow-ray/sage28.html). [Confirm? Dates? Connection with MIT Research Laboratory for Electronics?] (1999-12-16)