Found this list this morning in Jeffrey Phillips’s post: The Importance of Innovation Skills and Best Practices

1. Set the ground rules. There are a consistent set of rules for brainstorming, including "encourage wild ideas", "Go for quantity not quality", "Don't judge while ideating", etc.
2. Clearly define the opportunity or challenge. Make the issue smaller or simpler if necessary.
3. Define the scope - what should be considered and what should be ignored. We should have placed "all health care systems in the world" out of bounds from the start.
4. Allow people to ask clarifying questions before we start brainstorming. Once we start generating ideas, limit the questions, which often change scope.
5. Pick a scribe to capture ideas so the facilitator doesn't have to write down ideas and manage the group
6. Encourage the reticent and moderate the talkers. Any group, and ours was no exception, has people who are happy to toss ideas out all day long, and those who won't speak at all. We need to hear from everyone, and perhaps a bit less from some people (me included).
7. Keep the team on task and on target. When the "evaluate all health care systems in the world" statement was made, we should have been reminded that that was out of bounds, and we needed to refocus on what we could solve.
8. Stretch the group when necessary. The facilitator can/should occasionally ask questions that shift the group's thinking or introduces a new perspective.