Focus Groups to Study Work Practice
http://www.useit.com/papers/meghan_focusgroup.html

Ede, Meghan R.
Useit
2002

Abstract:

Focus groups are a good way to learn how people approach tasks and to get an overview of work that spans hours or days or longer periods. Focus groups can be a great way to learn about the work that occurs 'between' or 'around' the tools we build.