It seems we should first choose a postulate in order to discuss it properly. John McCarthy, one of the founders of the field who started getting attention in 1956, defined artificial intelligence as follows: “Intelligence is the computational part of the ability to achieve goals in the world. Varying kinds and degrees of intelligence occur in people, many animals and some machines”. This is an open, and yet inclusive definition: human intelligence isn't the only type of intelligence mentioned. This definition is the one he uses as a preamble to his other, more elaborate definition of AI: “artificial intelligence is the science and engineering of making intelligent machines, especially intelligent computer programs. It is related to the similar task of using computers to understand human intelligence, but AI does not have to confine itself to methods that are biologically observable”. This second, more precise definition, remains open on how to make intelligent machines. The how is very important, and we will use it as our starting postulate.