Argumentation is a very logical way of discussing or debating an idea. When you use the technique of argumentation, you prove something to be true or false.
Argumentation uses logic, persuasion, and various debate tactics to arrive at a conclusion. When a debater or negotiator follows the rules of argumentation, she backs up her ideas with very systematic, careful reasoning that makes her conclusion strong and believable. From the 15th century, argumentation has meant "presentation of formal arguments," from the Latin root argumentationem, "the bringing forth of a proof."