Card-sorting

Card-sorting is a method used to help design or evaluate the information architecture of a site. In a card-sorting session, participants organize topics into categories that make sense to them, and they may also help you label these groups. To conduct a card sort, you can use actual cards, pieces of paper, or one of the many online card-sorting software tools.

Card-sorting is a great way to become familiar with information architecture and user-centered design. It's cheap, reliable, and easy to set up. This is a technique where people take a bunch of stuff and organize it into groups that make sense to them. You analyze the grouping to create an information architecture.
Card-sorting is typically done in three groups of five to six people. You can do it independently, but it is better to do it in groups, especially where there is a large amount of data: