Card Sorting
http://www.ucc.ie/hfrg/emmus/methods/cardsort.html

European MultiMedia Usability Services
1999

Abstract:

This is a simple technique that enables one person or a group of people to create a categorisation of objects so that it is understood which objects belong with which other objects. Objects can be anything: menu items, blocks of content, proposed web pages, URLs. This method can be used by practically anybody after a few minutes practice.