Editing Lisp (programming language) (section)

==Object systems==
Various object systems and models have been built on top of, alongside, or into Lisp, including
* The [[Common Lisp Object System]], CLOS, is an integral part of ANSI Common Lisp. CLOS descended from New Flavors and CommonLOOPS. ANSI Common Lisp was the first standardized object-oriented programming language (1994, ANSI X3J13).
* ObjectLisp<ref name="NRrCu">pg 17 of Bobrow 1986</ref> or [[Object Lisp]], used by [[Lisp Machines Incorporated]] and early versions of Macintosh Common Lisp
* LOOPS (Lisp Object-Oriented Programming System) and the later [[CommonLoops]]
* [[Flavors (computer science)|Flavors]], built at [[Massachusetts Institute of Technology|MIT]], and its descendant New Flavors (developed by [[Symbolics]]).
* KR (short for Knowledge Representation), a [[Constraint satisfaction|constraint]]s-based object system developed to aid the writing of Garnet, a GUI library for [[Common Lisp]].
* [[Knowledge Engineering Environment]] (KEE) used an object system named UNITS and integrated it with an [[inference engine]]<ref name="YxD5o">Veitch, p 108, 1988</ref> and a [[Reason maintenance|truth maintenance]] system (ATMS).