Don't forget to keep a record of the ideas expressed. The group leader lists each idea as quickly as possible. Hesitation in recording the idea sometimes gives the impression of disapproval. Add an encouraging word when a shy or withdrawn person offers an idea. This positive reinforcement will make it more likely that they will contribute again.
Evaluation comes only after as many ideas as possible are brainstormed.
Then the group goes back over the list to determine which projects or ideas are valuable.