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Platform for developing Lisp-based Intelligent Software Agents

'LISA' is a platform for the development of Lisp-based Intelligent Software Agents. It is a production-rule system implemented in the Common Lisp Object System (CLOS), and is heavily influenced by CLIPS and the Java Expert System Shell (JESS). Its core is a reasoning engine based on an object-oriented implementation of the Rete algorithm solving the many-to-many matching problem. LISA can reason over CLOS objects without imposing special class hierarchy requirements, so users cans augment existing CLOS applications with reasoning capabilities. Also, the full power of Common Lisp is available for use within productions; there is no dichotomy between the programming language and its implementation. The project's goals include complete freedom of availability, ease of portbility, simplicity (so that new developers can easily understand code layout and behavior), familiarity (with roots in CLIPS and JESS, LISA will be familiar to those who've worked with these systems), and flexibility.


User reference guide available in HTML format from


version 3.2 (stable)
released on 17 September 2007

VCS Checkout


Related Projects



Verified by

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Verified by

Janet Casey

Verified on

3 June 2002

Leaders and contributors

David E. Young Maintainer

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webview
HelpMailing List Info/Archive
SupportMailing List Info/Archive

Software prerequisites

Required to buildThe CLOCC Port module and the Portable Defsystem (both included in the distribution)

This entry (in part or in whole) was last reviewed on 20 January 2017.


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