It is important to establish roles for before and during the debate. Dividing up the work will ensure that things go smoothly.
Keeps the team on task and makes final decisions about disagreements
Gathers the main arguments into an introductory statement. Does not give specific information; just says "this is true because of A and B and C."
Present the main arguments for the team. Each presenter give specific details that prove A and B and C.
Answer the arguments of the other team. These presenters must take notes as the other team is presenting their arguments and respond to every argument, using specific information to disprove them.
Presents the closing arguments for the team. Repeats the main idea for this and this and this reasons.