According to what has been stated in the Introduction clause, an electronic signature produced in accordance with the present document incorporates: "a commitment that has been explicitly endorsed under a signature policy, at a given time, by a signer under an identifier, e.g. a name or a pseudonym, and optionally a role". While the name of the signer is important, the position of the signer within a company or an organization can be even more important. Some contracts may only be valid if signed by a user in a particular role, e.g. a Sales Director. In many cases who the sales Director really is, is not that important but being sure that the signer is empowered by his company to be the Sales Director is fundamental.