I'm glad I wasn't asked to moderate this panel discussion.

David Ignatius' moderating role in this Davos forum was not an easy one to perform. Without getting into the merits of the underlying debate topic, I'm curious to hear from those who have moderated difficult panels about how they tried to control things to avoid panelists from leaving in a huff...and I guess I'm also interested in hearing from those on panels that failed regarding why they thought the panels failed!