A programming language for rule-based production systems. A rule consists of pre-condition(s) and a resulting action.

The system checks its working memory to see if there are rules whose pre-conditions are satisfied, if so, the action in one selected satisfied rule is executed.

There is a public domain implementation of an OPS5 interpreter written by Charles L. Forgy <[email protected]> in 1977. It was first implemented in lisp and later in bliss. It was also ported to common lisp by George Wood and Jim Kowalski.

clips is a language for writing expert systems, with some of the capabilities of OPS5.

See also c5, ops83, ops4, ops5+, ops83.

Inference Engine Tech, Cambridge MA.

an ops5 interpreter in common lisp.

a version by mark kantrowitz <[email protected]>.

["Programming Expert Systems in OPS5", L. Brownston et al, A-W 1985].

["An OPS5 Primer", Sherman et al, comes with OPS5 for DOS].

["Rule-Based Programming in the Unix System", G.T. Vesonder, AT&T Tech J 67(1), 1988].