CYC: A Midterm Report

  • Douglas Lenat
  • R. V. Guha


After explicating the need for a large commonsense knowledge base spanning human consensus knowledge, we report on many of the lessons learned over the first five years of attempting its construction. We have come a long way in terms of methodology, representation language, techniques for efficient inferencing, the ontology of the knowledge base, and the environment and infrastructure in which the knowledge base is being built. We describe the evolution of Cyc and its current state and close with a look at our plans and expectations for the coming five years, including an argument for how and why the project might conclude at the end of this time.
How to Cite
Lenat, D., & Guha, R. V. (1990). CYC: A Midterm Report. AI Magazine, 11(3), 32.