Discussion
Statement I: Adding more information to a display always improves the crew's picture.
Statement II: Beyond a point each extra symbol makes the others harder to find.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Adding information does not always improve the picture, and beyond a point it degrades it.
Statement II is correct and is why: each additional symbol competes for attention with every other, so the time to find a needed value rises and the chance of missing something important rises with it. The effect bites hardest at high workload, when the margin is least. Good display design is therefore as much about what to leave out, or to suppress by flight phase, as about what to show.
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