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What does it mean for a system to be brittle?

  • A.It cannot tolerate any error in the data supplied to it
  • B.It runs correctly only on the hardware it was developed on
  • C.It fails badly just outside the situations it was designed for
  • D.It requires frequent maintenance to keep running correctly

Answer: C

A brittle system performs well within its intended envelope and then degrades abruptly rather than gracefully when conditions move slightly outside it, which was the characteristic failure of rule based expert systems. Graceful degradation is the property wanted instead. Maintenance burden, data sensitivity and portability are separate weaknesses. How a system behaves at the edge of its competence matters at least as much as how it behaves at the centre, and it is much less often measured.

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