A room where a focus group is observed through a one-way mirror. The use of video technology to conduct real time focus groups with participants in different locations. Commonly used as a technique in Focus Grouping, market researchers interact with a selected group and are monitored and videoed by non-visible monitors, usually a Viewing Room.  This enables monitors to hear with permission, what their subjects have to say privately and observe their basic mannerisms.

See also:
Focus Groups
Focus group moderator 
Video focus groups