Reliability and safety are related but distinct dependability attributes for software. Describe two
important distinctions between these attributes. Explain why it is possible for a reliable system to
be unsafe and vice versa.
Solution
Explain why it is possible for a reliable system to be unsafe and vice versa.?
ANS:------> Because If the specification does not explicitly exclude dangerous behavior then a
system can be reliable but unsafe.RELIABILITYSAFETY1) Reliability involves much more
than analyzing test results, estimating remaining faults, and modeling future failure
probabilities.1)safety optimizes system safety in the design, development, use, and maintenance
of software systems and their integration with safety-critical hardware systems in an operational
environment.2)Ensuring system reliability does not necessarily lead to system safety as
Reliability is concerned with meeting the system specification (the system \'shall\')2)Safety is
concerned with excluding the possibility of dangerous behavior (the system \'shall not\').
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Reliability and safety are related but distinct dependability attrib.pdf
1. Reliability and safety are related but distinct dependability attributes for software. Describe two
important distinctions between these attributes. Explain why it is possible for a reliable system to
be unsafe and vice versa.
Solution
Explain why it is possible for a reliable system to be unsafe and vice versa.?
ANS:------> Because If the specification does not explicitly exclude dangerous behavior then a
system can be reliable but unsafe.RELIABILITYSAFETY1) Reliability involves much more
than analyzing test results, estimating remaining faults, and modeling future failure
probabilities.1)safety optimizes system safety in the design, development, use, and maintenance
of software systems and their integration with safety-critical hardware systems in an operational
environment.2)Ensuring system reliability does not necessarily lead to system safety as
Reliability is concerned with meeting the system specification (the system 'shall')2)Safety is
concerned with excluding the possibility of dangerous behavior (the system 'shall not')
