Card sorting is technique used to design the navigation structure of a website. The method involves asking representative users to group information into categories. Card sorting is a valuable tool while designing a new navigational structure or while validating an existing navigational structure as it is cheap, includes direct contact with the users, easily implementable.
There are two types of card sorting methods – open card sort and closed card sort. In open card sort the categories are kept open, the user can come up with their own categories. While in closed card sort the user has to use categorizes information within the categories provided.