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When can a system be said to be tolerant to error? When:
  • A
    its safety system has taken account of all statistically probable errors
  • B
    its safety system is too permeable to error
  • C
    latent errors do not entail serious consequences for safety
  • D
    the consequences of an error will not seriously jeopardise safety
Numerous studies of Human Errors rates during the performance of simple repetitive tasks have revealed that errors can normally be expected to occur about once in 100 times. This error rate can be significantly reduced (to about once in 1000 times) given the right conditions (combination of training and motivation)
  • A system can be tolerant to error when the consequences will not seriously jeopardize safety.
  • If one error is allowed to affect a whole system, the system is described as vulnerable.

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