Card Sorting
http://www.hostserver150.com/usabilit/tools/cardsorting.htm

UsabilityNet
2006

Abstract:

This is a method for discovering the latent structure in an unsorted list of statements or ideas. The investigator writes each statement on a small index card and requests six or more informants to sort these cards into groups or clusters, working on their own. The results of the individual sorts are then combined and if necessary analysed statistically.