Doug Lenat's Cyc project, one of the oldest and most ambitious projects to capture all of human knowledge in machine readable form, is "a determinedly scruffy enterprise" (according to Pamela McCorduck).
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The distinction was originally made by Roger Schank in the mid-1970s to characterize the difference between his work on natural language processing (which represented commonsense knowledge in the form of large amorphous semantic networks) from the work of John McCarthy, Allen Newell, Herbert A. Simon, Robert Kowalski and others whose work was based on logic and formal extensions of logic.