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Knowledge Engineering Environment (KEE) is a frame-based development tool for expert systems.cite-ref-1[1] It was developed and sold by IntelliCorp, and was first released in 1983. It ran on Lisp machines, and was later ported to Lucid Common Lisp with the CLX library, an X Window System (X11) interface for Common Lisp. This version was available on several different UNIX workstations.

On KEE, several extensions were offered:

• Simkit, a frame-based simulation librarycite-ref-2[2]cite-ref-3[3]

• KEEconnection, database connection between the frame system and relational databasescite-ref-4[4]

In KEE, frames are called units. Units are used for both individual instances and classes. Frames have slots and slots have facets. Facets can describe, for example, a slot's expected values, its working value, or its inheritance rule. Slots can have multiple values. Behavior can be implemented using a message passing model.

KEE provides an extensive graphical user interface (GUI) to create, browse, and manipulate frames.

KEE also includes a frame-based rule system. In the KEE knowledge base, rules are frames. Both forward chaining and backward chaining inference are available.

KEE supports non-monotonic reasoning through the concepts of worlds. Worlds allow providing alternative slot-values of frames. Through an assumption-based truth or reason maintenance system, inconsistencies can be detected and analyzed.cite-ref-5[5]

ActiveImages allows graphical displays to be attached to slots of Units. Typical examples are buttons, dials, graphs, and histograms. The graphics are also implemented as Units via KEEPictures, a frame-based graphics library.

• See also

• References

• External links

• Expert system

• Frame language

• Inference engine

• IntelliCorp (software)

• Knowledge base

• Knowledge-based system

• Knowledge representation

cite-note-11. ↑ An evaluation of expert system development tools. Ablex Publishing Corp. 1989. ISBN 9780893914943.

cite-note-22. ↑ citerefstelznerdyniscummins1989Stelzner, M.; Dynis, J.; Cummins, F. (1989). "The SimKit system: knowledge-based simulation and modeling tools in KEE". Proceedings of the 21st conference on Winter simulation - WSC '89. pp. 232–234. doi:10.1145/76738.76766. ISBN 0911801588. S2CID 18125370.

cite-note-33. ↑ SimKit: a model-building simulation toolkit. Ablex Publishing Corp. 1989. ISBN 9780893914943.

cite-note-44. ↑ KEEConnection: a bridge between databases and knowledge bases. Ablex Publishing Corp. 1989. ISBN 9780893914943.

cite-note-55. ↑ Reasoning with worlds and truth maintenance. Ablex Publishing Corp. 1989. ISBN 9780893914943.

• An Assessment of Tools for Building Large Knowledge-Based Systems