Safety and Reliability

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Lecture 11 Safety and Reliability
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Reliability
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Probability of failure
Time
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Redundancy
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• Security
• Deals with permitting or denying system access to
  appropriate individuals.
• A secure system is one that is relatively immune
  to attempts, intentional or not, to violate the
  security barriers set into place.

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• Safety
• Distinct from either reliability or security.
• A safe system is one that does not incur too much
  risk to people or equipment.
• A risk is event or condition that can occur but
  is undesirable. Risk is measured in terms of both
  severity and probability.
• Risk Probability of Failure Severity

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• Dependability

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Reliability Measures
1. Defects
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2. Mean Time To Defect (MTTD)
2. Mean Time To Failure (MTTF)
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Number of failures after time For basic model
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