 To become a member of Opus Dei one has to receive a divine calling or a vocation, a calling which requires practising the modes of the Opus Dei prelature.For this the directors of Opus Dei will have to discern if someone does have the vocation, before allowing him to be incorporated into the prelature.Incorporation into Opus Dei is done through a contractual bond between the person who has the vocation and the prelature.