Website Information Architecture: How to Optimize for UX
ConversionXL
APRIL 23, 2019
Tullis and Wood (authors of a prominent 2004 study) recommend testing 20–30 users for card sorting. Should the main menu be horizontal or vertical? While there’s a strong case against left-vertical menus , two studies (2003 and 2004) claim it’s better. How many users should you test?
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