(2nd-July-2020)
• Building large knowledge-based systems is complex because
• Knowledge often comes from multiple sources and must be integrated. Moreover, these sources may not have the same division of the world. Often knowledge comes from different fields that have their own distinctive terminology and divide the world according to their own needs.
• Systems evolve over time and it is difficult to anticipate all future distinctions that should be made.
• The people involved in designing a knowledge base must choose what individuals and relationships to represent. The world is not divided into individuals; that is something done by intelligent agents to understand the world. Different people involved in a knowledge-based system should agree on this division of the world.
• It is difficult to remember what your own notation means, let alone to discover what someone else's notation means. This has two aspects:
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