A formal discussion or debate is a type of discussion where a group of people make their logical arguments in support or against one side of argument.
In this kind of formal debate, there are usually:
It is the job of the moderator to make sure that the debaters are keeping to the rules and make sure that they are presenting their topics in the right way, etc.
The time keeper is in charge of making sure that each debater does not argue longer than was originally stipulated.
The Judges are in charge of awarding marks to each debater so that a winner can be decided at the end.
Please note that your question is incomplete, so I gave you a gneral overview to help you get the right answer.
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