A REASON explains why the author believes the claim (or thinks it is true or valid). An argument may have one reason or multiple reasons to be strong. REASONING are statements that link evidence back to reasons or claims. Reasoning should clearly explain why the evidence is relevant.

Reason deals with both logic and concepts, logic deals with concepts, and concepts are essentially just terms. Thus, while logic and reason are different, they are also closely related in that almost all types of reasoning utilize logic (and both logic and reasoning involve comparing concepts).