Moderator role

The moderator is helping the group of designers to make progress. She or he will guide the group in the process, but definitely not in content. The moderator's primary responsibility is to prevent the group from wasting time. For this reason, she will follow a program of milestones (milepebbles?) to prevent the group from getting stuck in a certain phase.
The moderator will:

Assure a fair chance for all participants to say their opinion.
Reduce the influence of single persons.
Indicate progress or absence of this to the group.
Summarize what the group has done so far to get to a common understanding.
Ask questions to make the group aware of missed areas.
Solve clashes between personalities by clearly stating the difference and leaving it at that.
Plan a time to see the results of other groups.

The moderator will not:

Steer the group into a certain direction.
Give "expert" advice.
Show bias.