Focus group / Basic / Tutorial / How / Tool

http://en.wikipedia.org/wiki/Focus_group
https://www.focusgroup.com/
http://managementhelp.org/businessresearch/focus-groups.htm
http://www.programevaluation.org/focusgroups.htm
http://www.webcredible.co.uk/user-friendly-resources/web-usability/focus-groups.shtml
http://www.omni.org/docs/FocusGroupToolkit.pdf