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To be effective, QR codes need clear, brief, contextual information and must lead the user to relevant pages.
Carousels on touch screens are plagued by low discoverability and sequential access, and not all designs implement swipe as a carousel control.
Carousels require good navigation and content to effectively communicate information in a crowded space.
The user's target was at the top of the page in 98-point font. But she failed to find it because the panel auto-rotated instead of staying still.