Performance Indicators
Annunciators Make Ineffective Performance Indicators
03.06.96 21:54
Annunciators make poor performance indicators
because they are driven by events rather than
being used to drive performance. From a human
factors perspective, annunciators exist to
compensate for our inability to monitor large
amounts of changing data effectively all the
time. Thus, an annunciator is provided to warn
the operator when a parameter exceeds some
boundary. Note that the annunciator has limited
value once in the alarm state because it cannot
tell you anything else about the situation other
than its still in the alarm state...
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On Annunciator Inadequacy
01.11.96 21:49
Imagine a control room where the sum of all the
indicators was reduced to eight or ten key
indicators which, through competent design,
provided the operator adequate information for
control of the plant. Annunciators would not be
needed unless it was intended or expected that
the operator would not focus his attention on the
indications...
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On Performance Indicators
11.30.95 21:42
"Task based measurements are finite Cartesian
interpretations that restrict you to incremental
change. You can only make the process more
efficient. Outcome based measurements ask "Why"
instead of "How" and open up the possibility for
quantum changes in performance because they are
not preconditioned to accept that the process has
to exist at all."
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