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The ancient Greeks are credited with the early development of categories, with Aristotle providing the foundations for the categorization scheme that we use today for plants and animals. Since then, card sorting has developed into a sophisticated multi-purpose method that is used in many different fields today. It helps designers to understand the users’ ‘mental models’ and gather insight into how users would group content to perform common tasks. Card sorting is also used in the means of education to let students organize and test their knowledge about a topic in an engaging way. It is also one of the techniques counselors use to help clients clarify their skills.