What is brought up must be relevant to the topic. One must be open to having one's view questioned and explain reasons for it. One must listen to what each person says and reflect on it. Priority of next speaker is given to one who is responding to the previous speaker or initiator of the view or question being discussed. Pauses in the discussion are opportune times to state a new view or question about the topic.
Civility goes hand in hand with reason.
Dialogue does not involve combative argument. We do challenge each other's opinions, but the format is collaborative inquiry. We try to uncover the pros and cons of a view. No view is beyond question. All views are welcome.