PS-DET-016 · r3
DETECTION
OBSERVED
ENGAGED
ATTENTION NARROWING
The edge of the surface is available only while nothing is happening.
01 DEFINITION
Condition in which the reach of a person's attention contracts as the demand at its centre rises, so whatever was placed at the edge of the surface sits where it will not be read at the moment it would count for most.
02 CONDITIONS
UNCERTAINTY
MISSING
How much of the surface is still being read is not available to anyone, including the reader.
TIME PRESSURE
HIGH
The contraction is caused by the demand; without the pressure the condition does not appear.
ERROR ASYMMETRY
ASYMMETRIC
What is missed at the edge and what is mishandled at the centre are failures of different size.
OPERATOR STATE
DEDICATED
The person is fully on this; the narrowing is what being fully on it does.
03 WHERE IT APPEARS
MEDICALSecondary indication sits at the margin of a monitor and is not read during the episode it was put there for.
MOBILITYPeripheral instrumentation is designed for a calm road and consulted only on one.
ENERGYSupporting values are placed around a main mimic and stop being available as the main event develops.
MANUFACTURINGLine-side status at the edge of a station is read between events rather than during them.
CONSTRUCTIONWarnings placed outside the working field of view are outside it exactly when the work is demanding.
LOGISTICSSecondary alerts on a handheld are attended to between tasks and not within one.
04 WHAT AEON WORKED THROUGH HERE
Everything that had to stay available was placed at the edge, and the edge turned out to be available only while nothing was happening. The moment the centre demanded anything, the edge was not read — not overlooked, not read at all. The work went into which few things are entitled to the centre during those moments, and into what the rest do instead of sitting where they cannot be seen.
What stays unresolved is where anything belongs that has to be read during the worst of it — the centre is already taken by whatever made it the worst of it, and moving something there means moving something else out.