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keeping the user engaged
lables
tip text
grab attention
user expectations
symbols
sound
colour
you need good sound so peaple can hear it clearly.
as soon as you see a tick and a cross you now what they mean tick means correct cross means wrong.
humans normally ascociate colours the same way because the colours red, amber and green mean unssuccesful, warning and succesful.
you need to grab the users attention to keep them engaged.
you need tip text because it gives you alternatives which are better than yours or fit better with your context.
you need lables to show what the things are.
intuitive design
consistensy
pop up messages
help features
you neeed this because it can show people how to use things.
make sure each screen is a consistent design.
to show when an error has occured andthe user can correct it.