Here's a topic session in progress, again from the July 2 gathering How can we improve the return on our investment in quality and excellence?. Each such session includes a number of people (five in this case) who have chosen to spend time on that particular topic.

As a key part of the Open Space approach, by the way, people are not bound to remain with one particular topic group for a whole time slot. In particular, if someone finds him or herself in a situation where they are not able to learn or to contribute, they are strongly recommended to move on, to join another group or simply to take time out to reflect.