The first thing one has to know before reading Aristotle s works is that he is a very schematic thinker who views all the aspects of knowledge related to each other forming a tidy whole. This will bring us to understand that he does not view logic as the great science nor as a separate matter, but just as a branch of that organized whole called science. In this sense, Aristotle did not believe that logic would be a further science to prove human knowledge but just a resource to elaborate a theory or a system that guided investigation, classification, and evaluation of the good and bad ways of reasoning. The aim of this writing is to reveal Aristotle s conception of logic, or Aristotle s logic, that, as some authors have seen, is not the same as what have been usually called Aristotelian logic.