Determine roles - Project Sponsor, Project Leader, Recordkeeper, Timekeeper, Clients. Continue holding JAD meetings approximately every week or every other week until you have reached consensus on a design. Develop your timebox - list of tasks, who is assigned and when each task is due. A diverse team, representative of all areas effected by this project. Every person in the group has equal responsibility and decision making power.
Every idea is valuable.
Throughout the JAD, listen and acknowledge each idea and concern. Evaluating ideas during a brainstorming session will shut down the creative process. The best idea may never get said out of fear of being shot down. Participation by everyone is very important. Encourage quieter members to speak, they often have the best ideas.