lisp object-oriented programming system

from The Free On-line Dictionary of Computing (8 July 2008)

Lisp Object-Oriented Programming System

   (LOOPS) An {object-oriented} extension of {Lisp} from the
   {Intelligent Systems Laboratory} at {Xerox} {Palo Alto
   Research Center}.  It is used in the development of
   {knowledge-based systems}.

   See also {CommonLoops}.

   ["The LOOPS Manual", D.G. Bobrow & M. Stefik, Xerox Corp
   1983].