Levels of attention |
No disturbances, all is as usual and required | |
Some disturbance |
Serious disturbance, look here NOW and decide what to do NOW.
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No corrective action performed or too late, disaster occurred, game over, try other solution
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Colour |
Standard colour,
e.g. black characters (on white background).
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Yellow
Conspicuous, no strong alerting value. Aide de memoire.
Yellow characters
Yellow characters on a light background might have a too low luminance contrast to be readable and conspicuous. In that case a yellow background might be chosen. |
Orange
Orange has alerting value: decide now (as orange for traffic lights: decide now: brake or increase speed.)
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Red
Red is unconspicuous for the human eye, so high luminance contrast (on light background dark red characters, on dark background light red characters). |
Action of the user |
No action. | |
Action required shortly, prepare.
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Action NOW!
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Action too late, game over. |
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Train passenger

No delays, platform changes. Departure in 15 min, sufficient time for coffee. | |
Train passenger

Delay, change of platform. More/less stops than ususal. |
Train passenger
Action: Train departing in 30 seconds (half decreasing circle), no time for coffee. RUN! |
Train passenger
Train left without you. Find other train, go by car.
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Teacher
Proceed to next subject to learn; | |
Teacher
Remedial action for the yellow subject. |
Teacher Call student; next time test in an earlier phase. |
Teacher
Stop this course for this student. |
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Overview of several dimensions of learning goals and student’s performance (small colored squares). | |
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Train driver

Maintain speed.
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Train driver

Prepare for braking, approaching red signal. |
Train driver

Brake now! |
Train driver

Safety system now applies the brakes.
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