A use case is a written description of how users will perform tasks on your website. It outlines, from a user’s point of view, a system’s behavior as it responds to a request.
Improving the User Experience 
Interaction Design Methods
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Card sorting is a method used to help design or evaluate the information architecture of a site.
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A prototype is a draft version of a product that allows you to explore your ideas and show the intention behind a feature or the overall design concept to users before investing time and money into development.