The man standing up is the facilitator.
The six people sitting down are observers. They come from various
departments of the company that owns the web site.
What
The facilitator and the observers are in a room
with two monitors.
The monitor at the left will show the customer and the computer
screen.
The monitor at the right is a direct feed from the computer monitor.
When
The usability test is
about to start. The customer who will test the web site has arrived.