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functional group guidelines and reasoning

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Robin Clark 2011-08-08 10:35:01 +01:00
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fmmd_concept/fmmd_concept.tex
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@ -321,7 +321,7 @@ In practise, this following to all components on the signal path, will not be do
Typically simpler scenarios will be used where the effect of Typically simpler scenarios will be used where the effect of
the component failure will be considered in isolation and then applied to the signal path. the component failure will be considered in isolation and then applied to the signal path.
\paragraph{Reasoning distance - complexity and reach-ability.} \paragraph{Concept of `reasoning distance' - complexity and reach-ability.}
Tracing a component level failure up to a top level event, without the rigour accompanying state explosion, involves Tracing a component level failure up to a top level event, without the rigour accompanying state explosion, involves
working heuristically. A base component failure will typically working heuristically. A base component failure will typically
be conceptually removed by several stages from a top level event. be conceptually removed by several stages from a top level event.
@ -1135,9 +1135,9 @@ failure modes and environmental factors.
\subsection{Justification of wishlist} \subsection{Justification of desirable requirements}
By applying the methodology in section \ref{fmmdproc}, the wishlist can By applying the methodology in section \ref{fmmdproc}, the desirable requirements can
now be evaluated for the proposed FMMD methodology. now be evaluated for the proposed FMMD methodology.
\subsubsection{All component failure modes must be considered in the model.} \subsubsection{All component failure modes must be considered in the model.}
@ -1335,6 +1335,14 @@ The terms used in FMMD and the UML data model are further refined in
chapter \ref{defs}. chapter \ref{defs}.
} }
\section{The {\fg}: discussion and guidelines}
Talk about reasons why {\fgs} should be small but complete enough
to perform a given function.
If they become too big we have a state explosion problem.
If too small they become meaningless. PD is a good example of this
appropriate for most situations, but perhaps getting confusing if applied to a non inverting op-amp gain stage.
\section{Conclusion} \section{Conclusion}
This This