Letters of services are the instruments through which organs, bodies and public entities and other entities of the General state administration in informing citizens and users on services under their responsibility, on their rights in relation to those and on quality in service delivery. Its origin is linked to improve public services, in response to citizens' demands.

The charter of the public employment service State provides information on the most important services provided by the agency and levels of quality in service delivery, as reflected in the commitments to people that the Charter.