In addition to buttons that allow the user to navigate from one page or card to the next, a stack should have other buttons that allow the user to move from one part of the stack to a different part.
Navigation buttons should be located in a different place on the card than card specific buttons.
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8. Progress indicators
Users need to know how much of a stack they have covered. There are several means of accomplishing this. One of the most simple is:
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A thermometer metaphor or pie chart are more complex types of progress indicators.