The testament is a legal act that requires certain formalities for its validity which are imposed by de Civil Law, it is for Notary and the witnesses to become the guardian of these formalities. In the case an open will, the participation of three witnesses is essential to hear what the testator ordered together with the notary, who will read the will aloud and in a single act for its subsequent signature and fingerprint by the testator and witnesses. The Law deposits in the Notary the public faith for the legal acts and contracts it attends and the confidence for its custody; for that reason the Notary exercises a public function to attest to the acts that are submitted to its consideration, but not responsible for the content of the documents, but of the formal aspect.