When a hearing person speaks, an interpreter will render the speaker's meaning into the sign language used by the deaf party. When a deaf person signs, an interpreter will render the meaning expressed in the signs into the spoken language for the hearing party, which is sometimes referred to as voice interpreting or voicing. This may be performed either as simultaneous or consecutive interpreting. Skilled sign language interpreters will position themselves in a room or space that allows them both to be seen by deaf participants and heard by hearing participants clearly and to see and hear participants clearly. In some circumstances, an interpreter may interpret from one sign language into an alternate sign language. Deaf people also work as interpreters. They team with hearing counterparts to provide interpretation for deaf individuals who may not share the standard sign language used in that country. In other cases the hearing interpreted sign may be too pidgin to be understood clearly, and the Deaf interpreter might interpret it into a more clear translation. They also relay information from one form of language to another — for example, when a person is signing visually, the deaf interpreter could be hired to copy those signs into a deaf-blind person's hand plus include visual information. In the United States, Sign Language Interpreters have National and State level associations. The Registry of Interpreters for the Deaf (RID) is the national certifying body. In addition to training requirements and stringent certification testing, the RID members must abide by a Code of Professional Conduct, Grievance Process and Continuing Education Requirement. Sign Language Interpreters can be found in all types of interpreting situations, as listed in this article. Most interpreters have had formal training, in an Interpreter Training Program (ITP). ITP lengths vary, being available as a two-year or four-year degree or certificate. There are graduate programs available as well.