1. CommonLoops Xerox's object-oriented Lisp which led to CLOS. See also Portable CommonLoops. ftp://arisia.xerox.com/pub/pcl/September-16-92-PCL-c.tar.Z ["CommonLoops: Merging Lisp and Object-Oriented Programming", D.G. Bobrow et al, SIGPLAN Notices 2111:17-29 Nov 1986].