Only later is discernment needed. Encourage each member to come up with at least one novel idea. After a variety of ideas appear, pass out paper and pens and have the group reflect silently on them, writing down their thoughts. When enough quiet time has elapsed, invite input and write it on newsprint. Take a break.
Creativity is hard work.
Let the group get up, move around, and converse freely with each other. Allowing the mind to take a vacation for a time helps the subconscious lend a hand. The task-oriented people may be impatient and discouraged by the lack of specifics thus far. Reassemble and begin to direct attention to definite plans. Outline the various elements of your task.