Abstract
Practical reason is the use of reason to decide how to act and perform in a social reality. When someone deliberates about what to do, one puts all the reasons for the action, and then all the reasons against the action will determine the outcome of the action. In that situation, we can describe that practical action with reason because we will determine reason with the weight of different reasons not on the weighing reasons. In this paper, we analyze that reasons have weight against the theory that weights of reasons have no role in a theory of reasoning, and defend that reasons have weight with the evidence of practical reasons. The aim of this paper is to argue that weight of reasons has a role in the process of reasoning. In every situation of life, we can use have reason and weight of reason according to the practical situation of life.