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Robin Clark 2010-10-27 10:50:15 +01:00
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fmmd_concept/fmmd_concept.tex
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@ -180,7 +180,8 @@ failure mode behaviour for say, differnet ambient pressures or temperatures.
If $E$ is the number of applied states or environmental conditions to consider If $E$ is the number of applied states or environmental conditions to consider
in a system, the job of the bottom-up analyst is complicated by a cross product factor again in a system, the job of the bottom-up analyst is complicated by a cross product factor again
$(N-1) \times N \times K \times E$. $(N-1) \times N \times K \times E$.
If we put some typical very small embedded system numbers into this, say $N=100$, $K=2.5$ and $E=10$ If we put some typical very small embedded system numbersi\footnote{these figures would
be typical of a very simple temperature controller, with a micro-controller sensor and heater circuit} into this, say $N=100$, $K=2.5$ and $E=10$
we have $99 \times 100 \times 2.5 \times 10 = 247500 $. we have $99 \times 100 \times 2.5 \times 10 = 247500 $.
To look in detail at a quarter of a million test cases is obviously impractical. To look in detail at a quarter of a million test cases is obviously impractical.