Focus Group Usability Testing
http://www.goodusability.co.uk/2008/11/focus-group-usability-testing/

Hamill, David
Good Usability
2008

Abstract:

In today’s financial climate, organisations are trying to cut costs. This has led to lots of new and innovative cost-cutting usability techniques springing up. Some of them are ingenious, but not every cost saving measure is a good idea. One technique that is becoming popular with some is focus group usability testing. I recommend that you avoid this technique completely. I’ll try to explain why.