In the present text, the author will put forward a novel theory of logic, Praxeological Logic. Praxeological Logic will be analyzed and put in relation with the logical construct called under the name of Postulated Logic which, in ultimate analysis, will be incorporated in the general theory of Praxeological Logic. The readers will be in a position to understand how Postulated Logic is preparatory for the construction of a correct Praxeological Theory. The author will, in addition, put the focus on Utilitarian Theory.