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@ -272,7 +272,7 @@ to represent the results of analysis phases.
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The four methodologies in current use are discussed briefly below.
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The four methodologies in current use are discussed briefly below.
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\subsection { FTA }
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\subsection { FTA }
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\glossary{name={FTA},description={Fault Tree Analysis}}
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This, like all top~down methodologies introduces the very serious problem
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This, like all top~down methodologies introduces the very serious problem
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of missing component failure modes \cite{faa}[Ch.9].
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of missing component failure modes \cite{faa}[Ch.9].
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%, or modelling at
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%, or modelling at
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@ -15,7 +15,7 @@ The methodology developed was designed to cope with
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both the deterministic\footnote{Deterministic failure mode analysis traces failure mode effects} and probablistic approaches
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both the deterministic\footnote{Deterministic failure mode analysis traces failure mode effects} and probablistic approaches
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\footnote{Probablistic failure mode analysis tries to determine the probability of given SYSTEM failure modes, and pfrom these
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\footnote{Probablistic failure mode analysis tries to determine the probability of given SYSTEM failure modes, and pfrom these
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can determine an overall failure rate, in terms of probability of failure on demand, or failure in time (or Mean Time to Failure (MTTF).}.
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can determine an overall failure rate, in terms of probability of failure on demand, or failure in time (or Mean Time to Failure (MTTF).}.
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\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environemntal catastophy or severe loss or damage}}
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\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environmental catastrophe or severe loss or damage}}
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\paragraph{Safety Critical Controllers, knowledge and culture sub-disiplines}
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\paragraph{Safety Critical Controllers, knowledge and culture sub-disiplines}
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@ -242,7 +242,7 @@ a process of modularisation from the bottom~up.
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\end{list}
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\end{list}
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\section{Safety Critical Systems}
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\section{Safety Critical Systems}
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\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environemntal catastophy or severe loss or damage}}
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\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environmental catastrophe or severe loss or damage}}
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%
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%
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%How safe is "safe"?
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%How safe is "safe"?
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%The word "safety" is too general—it really doesn't mean anything definitive. Therefore, we use terms such as safety-related and safety-critical.
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%The word "safety" is too general—it really doesn't mean anything definitive. Therefore, we use terms such as safety-related and safety-critical.
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@ -43,6 +43,8 @@ describe briefly what a base component failure mode is and what a system level f
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\subsection { FTA }
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\subsection { FTA }
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\glossary{name={FTA},description={Fault Tree Analysis}}
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%, or modelling at
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%, or modelling at
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%a too high level of failure mode abstraction.
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%a too high level of failure mode abstraction.
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FTA was invented for use on the minuteman nuclear defence missile
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FTA was invented for use on the minuteman nuclear defence missile
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