  The impression of free will is the feeling according to which our choices are
neither imposed from our inside nor from outside. It is the sense we are the
ultimate cause of our acts. In direct opposition with the universal
determinism, the existence of free will continues to be discussed. In this
paper, free will is linked to a decisional mechanism: an agent is provided with
free will if having performed a predictable choice Cp, it can immediately
perform another choice Cr in a random way. The intangible feeling of free will
is replaced by a decision-making process including a predictable
decision-making process immediately followed by an unpredictable decisional
one.
