How to do it

1. Before the meeting, prepare several sheets of paper with a 2×2 or 2×3 grid. Make sure boxes are large enough to sketch an idea, but not so large that multiple ideas can be put into a single box. Try to have space for at least 10 ideas per round.
2. When the meeting begins, give each player a sheet and explain how the activity works.
3. Next, set a timer for 5 minutes.
4. Tell the players to sit silently and sketch out as many ideas as they can until the timer ends — with the goal of reaching 6-8 ideas. The sketches can and should be very rough — nothing polished in this stage.
5. When the time runs out, the players should share their sketches with the rest of the group. The group can ask questions of each player, but this is not a time for a larger brainstorming session. Make sure every player presents his/her sketches.
6. With time permitting, repeat another few rounds of 6-8-5. Players can further develop any ideas that were presented by the group as a whole or can sketch new ideas that emerged since the last round. They can continue to work on separate ideas, or begin working on the same idea. But the 5-minute sketching sprint should always be done silently and independently.

Adapted from Gamestorming