#30638
Creating a product that has a logical information structure is critical to the success of the product. A good structure helps users find information and accomplish their tasks with ease. Card sorting is one method that can help us understand how users think the information and navigation should be within a product.
Dick, David J. Usability Interface (2007). Articles>User Centered Design>Methods>Card Sorting
#19928
Sorting Techniques for User-Centered Information Design 
Card, or pile, sorting has long been used in social sciences to identify how humans group words or concepts together. Can such sorting also inform information design? Can we use it to better anticipate what users are looking for when they open a book, a Help system, a library catalog, or a Web site? A review of literature and a variety of published case studies suggests how various sorting techniques are suited to different research goals. How to carry out a sorting study is discussed, and analysis methods applicable to the goals for an information design project are reviewed. We look at automation tools as a means of reducing analysis tedium, and as a means to expand a potential study audience via remote participation.
Deaton, Mary M. Techne (2003). Design>User Centered Design>Methods>Card Sorting
#35105
Card Sorting: Pushing Users Beyond Terminology Matches
It's easy to bias study participants, whether in user testing or in card sorting, if they focus on matching stimulus words instead of working on the underlying problem.
Nielsen, Jakob. Alertbox (2009). Articles>User Centered Design>Methods>Card Sorting
