One critical role that MUST be defined is that of the chair. Attendees and the chairperson must be on the same wavelength. We suggest that a group that meets on a regular basis establish meeting parameters, roles and chairperson authorities early in their life cycle. We also suggest that the group revisit these parameters periodically to see if they are working, or need revision. Get the roles clear from the beginning so that you will not have to deal with them in each and every meeting.
Some people are naturally long-winded.
They talk a lot. Unfortunately, long-winded people can monopolize meeting time, and turn off other meeting participants. If you are chairing a meeting with long-winded people in attendance, you need to take some action. One common one is holding up one's hand, palm outward towards the speaker. Generally, this will be better received by the speaker if it is accompanied by a smile rather than a frown or obvious anger.