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Language interpretation is the facilitating of oral or sign-language communication, either simultaneously or consecutively, between users of different languages. The process is described by both the words interpreting and interpretation. Translation studies deal with the systematic study of the theory, the description and the application of language interpretation and translation.
In professional parlance, interpreting denotes the facilitating of communication from one language form into its equivalent, or approximate equivalent, in another language form; while interpretation denotes the actual product of this work, that is, the message thus rendered into speech, sign language, writing, non-manual signals, or other language form. This important distinction is observed in order to avoid confusion.
An interpreter is a person who converts a thought or expression in a source language into an expression with a comparable meaning in a target language either simultaneously in "real time" or consecutively after one party has finished speaking. The interpreter's function is to convey every semantic element (tone and register) and every intention and feeling of the message that the source-language speaker is directing to target-language recipients.
Comparison to translation 
Despite being used in a non-technical sense as interchangeable, interpretation and translation are not synonymous. Interpreting takes a message from a source language and renders that message into a diferent target language (ex: English into French). In interpreting, the interpreter will take in a complex concept from one language, choose the most appropriate vocabulary in the target language to faithfully render the message in a linguistically, emotionally, tonally, and culturally equivalent message. Translation is the transference of meaning from text to text (written or recorded), with the translator having time and access to resources (dictionaries, glossaries, etc.) to produce an accurate document or verbal artifact. Lesser known is "transliteration," used within sign language interpreting, takes one form of a language and transfer those same words into another form  (ex: spoken English into a signed form of English, Signed Exact English, not ASL).
In court interpretation, it is not acceptable to omit anything from the source, no matter how quickly the source speaks, since not only is accuracy a principal canon for interpreters, but mandatory. The alteration of even a single word in a material can totally mislead the triers of fact. The most important factor for this level of accuracy is the use of a team of two or more interpreters during a lengthy process, with one actively interpreting and the second monitoring for greater accuracy.
Translators have time to consider and revise each word and sentence before delivering their product to the client. While live interpretation's goal is to achieve total accuracy at all times, details of the original (source) speech can be missed and interpreters can ask for clarification from the speaker. In any language, including sign languages, when a word is used for which there is no exact match, expansion may be necessary in order to fully interpret the intended meaning of the word (ex: the English word "hospitable" may require several words or phrases to encompass its complex meaning). Another unique situation is when an interpreted message appears much shorter or longer than the original message. The message may appear shorter at times because of unique efficiencies within a certain language. English to Spanish is a prime example: Spanish uses gender specific nouns, not used in English, which convey information in a more condensed package thus requiring more words and time in an English interpretation to provide the same plethora of information. Because of situations like these, interpreting often requires a "lag" or "processing" time. This time allows the interpreter to take in subjects and verbs in order to rearrange grammar appropriately while picking accurate vocabulary before starting the message. While working with interpreters, it is important to remember lag time in order to avoid accidentally interrupting one another and to receive the entire message.
In (extempore) simultaneous interpretation (SI), the interpreter renders the message in the target-language as quickly as he or she can formulate it from the source language, while the source-language speaker continuously speaks; an oral-language SI interpreter, sitting in a sound-proof booth, speaks into a microphone, while clearly seeing and hearing the source-language speaker via earphones. The simultaneous interpretation is rendered to the target-language listeners via their earphones. Moreover, SI is the common mode used by sign language interpreters, although the person using the source language, the interpreter and the target language recipient (since either the hearing person or the deaf person may be delivering the message) must necessarily be in close proximity.
The first introduction and employment of extempore simultaneous interpretation was the Nuremberg Trials, with four official working languages.
In consecutive interpreting (CI), the interpreter speaks after the source-language speaker has finished speaking. The speech is divided into segments, and the interpreter sits or stands beside the source-language speaker, listening and taking notes as the speaker progresses through the message. When the speaker pauses or finishes speaking, the interpreter then renders a portion of the message or the entire message in the target language.
Consecutive interpretation is rendered as "short CI" or "long CI". In short CI, the interpreter relies on memory, each message segment being brief enough to memorize. In long CI, the interpreter takes notes of the message to aid rendering long passages. These informal divisions are established with the client before the interpretation is effected, depending upon the subject, its complexity, and the purpose of the interpretation.
On occasion, document sight translation is required of the interpreter during consecutive interpretation work. Sight translation combines interpretation and translation; the interpreter must render the source-language document to the target-language as if it were written in the target language. Sight translation occurs usually, but not exclusively, in judicial and medical work.
Consecutively interpreted speeches, or segments of them, tend to be short. Fifty years ago, the CI interpreter would render speeches of 20 or 30 minutes; today, 10 or 15 minutes is considered too long, particularly since audiences usually prefer not to sit through 20 minutes of speech they cannot understand.
Often, if not previously advised, the source-language speaker is unaware that they may speak more than a single sentence before the CI interpretation is rendered and might stop after each sentence to await its target-language rendering. Sometimes, however, depending upon the setting or subject matter, and upon the interpreter's capacity to memorize, the interpreter may ask the speaker to pause after each sentence or after each clause. Sentence-by-sentence interpreting requires less memorization and therefore lower likelihood for omissions, yet its disadvantage is in the interpreter's not having heard the entire speech or its gist, and the overall message is sometimes harder to render both because of lack of context and because of interrupted delivery (for example, imagine a joke told in bits and pieces, with breaks for translation in between). This method is often used in rendering speeches, depositions, recorded statements, court witness testimony, and medical and job interviews, but it is usually best to complete a whole idea before it is interpreted.
Full (i.e., unbroken) consecutive interpreting of whole thoughts allows for the full meaning of the source-language message to be understood before the interpreter renders it in the target language. This affords a truer, more accurate, and more accessible interpretation than does simultaneous interpretation.
In whispered interpreting (chuchotage, in French), the interpreter sits or stands next to the small target-language audience whilst whispering a simultaneous interpretation of the matter to hand; this method requires no equipment, but may be done via a microphone and headphones if the participants prefer. Chuchotage is used in circumstances where the majority of a group speaks the source language, and a minority (ideally no more than three people) does not speak it.
Relay interpreting is usually used when there are several target languages. A source-language interpreter interprets the text to a language common to every interpreter, who then render the message to their respective target languages. For example, a Japanese source message first is rendered to English to a group of interpreters, who listen to the English and render the message into Arabic, French, and Russian, the other target languages. In heavily multilingual meetings, there may be more than one "intermediate" language, i.e. a Greek source language could be interpreted into English and then from English to other languages, and, at the same time, it may also be directly interpreted into French, and from French into yet more languages. This solution is most often used in the multilingual meetings of the EU institutions.
Liaison interpreting involves relaying what is spoken to one, between two, or among many people. This can be done after a short speech, or consecutively, sentence-by-sentence, or as chuchotage (whispering); aside from notes taken at the time, no equipment is used.
Conference interpreting is the interpretation of a conference, either simultaneously or consecutively, although the advent of multi-lingual meetings has consequently reduced the consecutive interpretation in the last 20 years.
Conference interpretation is divided between two markets: the institutional and private. International institutions (EU, UN, EPO, et cetera), holding multi-lingual meetings, often favour interpreting several foreign languages to the interpreters' mother tongues. Local private markets tend to bi-lingual meetings (the local language plus another) and the interpreters work both into and out of their mother tongues; the markets are not mutually exclusive. The International Association of Conference Interpreters (AIIC) is the only worldwide association of conference interpreters. Founded in 1953, it assembles more than 2,800 professional conference interpreters in more than 90 countries.
Judicial, legal, or court interpreting occurs in courts of justice, administrative tribunals, and wherever a legal proceeding is held (i. e., a police station for an interrogation, a conference room for a deposition, or the locale for taking a sworn statement). Legal interpreting can be the consecutive interpretation of witnesses' testimony, for example, or the simultaneous interpretation of entire proceedings, by electronic means, for one person, or all of the people attending.
The right to a competent interpreter for anyone who does not understand the language of the court (especially for the accused in a criminal trial) is usually considered a fundamental rule of justice. Therefore, this right is often guaranteed in national constitutions, declarations of rights, fundamental laws establishing the justice system or by precedents set by the highest courts. However, it is not a constitutionally required procedure (in the United States) that a certified interpreter be present at police interrogation.
Depending upon the regulations and standards adhered to per state and venue, court interpreters usually work alone when interpreting consecutively, or as a team, when interpreting simultaneously. In addition to practical mastery of the source and target languages, thorough knowledge of law and legal and court procedures is required of court interpreters. They are often required to have formal authorization from the State to work in the Courts — and then are called certified court interpreters. In many jurisdictions, the interpretation is considered an essential part of the evidence. Incompetent interpretation, or simply failure to swear in the interpreter, can lead to a mistrial.
In escort interpreting, an interpreter accompanies a person or a delegation on a tour, on a visit, or to a meeting or interview. An interpreter in this role is called an escort interpreter or an escorting interpreter. This is liaison interpreting.
Public sector 
Also known as community interpreting, is the type of interpreting occurring in fields such as legal, health, and local government, social, housing, environmental health, education, and welfare services. In community interpreting, factors exist which determine and affect language and communication production, such as speech's emotional content, hostile or polarized social surroundings, its created stress, the power relationships among participants, and the interpreter's degree of responsibility — in many cases more than extreme; in some cases, even the life of the other person depends upon the interpreter's work.
Medical interpreting is a subset of public service interpreting, consisting of communication among medical personnel and the patient and his or her family or among medical personnel speaking different languages, facilitated by an interpreter, usually formally educated and qualified to provide such interpretation services. In some situations medical employees who are multilingual may participate part-time as members of internal language banks. The medical interpreter must have a strong knowledge of medicine, common medical procedures, the patient interview, the medical examination processes, ethics, and the daily workings of the hospital or clinic where he or she works, in order to effectively serve both the patient and the medical personnel. Moreover, and very important, medical interpreters often are cultural liaisons for people (regardless of language) who are unfamiliar with or uncomfortable in hospital, clinical, or medical settings. For example, in China, there is no mandatory certificate for medical interpreters as of 2012. Most interpretation in hospitals in China is done by doctors, who are proficient in both Chinese and English (mostly) in his/her specialty. They interpret more in academic settings than for communications between doctors and patients. When a patient needs English language service in a Chinese hospital, more often than not the patient will be directed to a staff member in the hospital, who is recognized by his/her colleagues as proficient in English. The actual quality of such service for patients or medical translation for communications between doctors speaking different languages is unknown by the interpreting community as interpreters who lack medical background rarely receive accreditation for medical translation in the medical community.
Sign language 
An interpreter must accurately convey messages between two different languages. An interpreter is there for both the Deaf, which refers to the culture and being of an individual who is legally deaf, and a hearing individual.  The act of interpreting is when a hearing person speaks, an interpreter will render the speaker's meaning into the sign language, or other forms used by the Deaf party. The other end of interpreting is when a Deaf person signs, an interpreter will render the meaning expressed in the signs into the oral 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 to be seen by the deaf participants and heard clearly by hearing participants. As well as be in a position to hear and/or see the speaker or speakers clearly. In some circumstances, an interpreter may interpret from one language to another whether that is English to English Sign Language, English to American Sign Language, Spanish to English to American Sign Language and so on.
Deaf individuals also have the opportunity to work as interpreters. The Deaf individual will team with a hearing counterpart to provide interpretation for deaf individuals who may not know the same sign language used in that country, who have minimal language skills, are developmentally delayed or have other mental and/or physical disabilities which make communication a unique challenge. In other cases the hearing interpreter may interpret in the sign language, whichever kind of sign language the team knows and the Deaf team will then interpret into the language in which the individual can understand. They also interpret information from one medium of language into 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 and add visual information.
In the United States, Sign Language Interpreters have National and State level certifications. The Registry of Interpreters for the Deaf (RID), a non-profit organization, is known for its national recognition and certification process. 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. There are many interpreter-training programs in the U.S. The Collegiate Commission on Interpreter Education is the body that accredits Interpreter Preparation Programs. A list of accredited programs and the value of accreditation can be found on the website listed: http://ccie-accreditation.org/09/Accredited.html.
In Europe and other countries have their own national association of Sign Language Interpreters as well as Sign Language. Some countries have more than one national association due to regional or language differences. The European Forum of Sign Language Interpreters (efsli) is the umbrella organization of sign language interpreters in Europe.
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.
By its very nature, media interpreting has to be conducted in the simultaneous mode. It is provided particularly for live television coverages such as press conferences, live or taped interviews with political figures, musicians, artists, sportsmen or people from the business circle. In this type of interpreting, the interpreter has to sit in a sound-proof booth where ideally he/she can see the speakers on a monitor and the set. All equipment should be checked before recording begins. In particular, satellite connections have to be double-checked to ensure that the interpreter's voice is not sent back and the interpreter gets to hear only one channel at a time. In the case of interviews recorded outside the studio and some current affairs programme, the interpreter interprets what he or she hears on a TV monitor. Background noise can be a serious problem. The interpreter working for the media has to sound as slick and confident as a television presenter.
Media interpreting has gained more visibility and presence especially after the Gulf War. Television channels have begun to hire staff simultaneous interpreters. The interpreter renders the press conferences, telephone beepers, interviews and similar live coverage for the viewers. It is more stressful than other types of interpreting as the interpreter has to deal with a wide range of technical problems coupled with the control room's hassle and wrangling during live coverage.
Interpreting services can be delivered in multiple modalities. The most common modality through which interpreting services are provided is on-site interpreting.
Also called "in-person interpreting," this delivery method requires the interpreter to be physically present in order for the interpretation to take place. In on-site interpreting settings, all of the parties who wish to speak to one another are usually located in the same place. This is by far the most common modality used for most public and social service settings.
Also referred to as "over-the-phone interpreting," "telephonic interpreting," and "tele-interpreting," telephone interpreting enables the interpreter to deliver interpretation via telephone. The interpreter is added to a conference call. Telephone interpreting may be used in place of on-site interpreting in some cases, especially when no on-site interpreter is readily available at the location where services are needed. However, telephone interpreting is more commonly used for situations in which all parties who wish to communicate are already speaking to one another via telephone (e.g. applications for insurance or credit cards that are taken over the phone, inquiries from consumers to businesses that take place via telephone, etc.)
Interpretation services via Video Remote Interpreting (VRI) or a Video Relay Service (VRS) are useful where one of the parties is deaf, hard-of-hearing or speech-impaired (mute). In such cases the interpretation flow is normally within the same principal language, such as French Sign Language (FSL) to spoken French, Spanish Sign Language (SSL) to spoken Spanish, British Sign Language (BSL) to spoken English, and American Sign Language (ASL) also to spoken English (since BSL and ASL are completely distinct), etc.... Multilingual sign language interpreters, who can also translate as well across principal languages (such as to and from SSL, to and from spoken English), are also available, albeit less frequently. Such activities involve considerable effort on the part of the translator, since sign languages are distinct natural languages with their own construction and syntax, different from the aural version of the same principal language.
With video interpreting, sign language interpreters work remotely with live video and audio feeds, so that the interpreter can see the deaf or mute party, converse with the hearing party and vice versa. Much like telephone interpreting, video interpreting can be used for situations in which no on-site interpreters are available. However, video interpreting cannot be used for situations in which all parties are speaking via telephone alone. VRI and VRS interpretation requires all parties to have the necessary equipment. Some advanced equipment enables interpreters to control the video camera, in order to zoom in and out, and to point the camera toward the party that is signing.
The majority of professional full-time conference interpreters work for phone interpreting agencies, health care institutions, courts, school systems and international organizations like the United Nations, the European Union, or the African Union.
The world's largest employer of interpreters is currently the European Commission, which employs hundreds of staff and freelance interpreters working into the official languages of the European Union. The European Union's other institutions (the European Parliament and the European Court of Justice) have smaller interpreting services.
The United Nations employs interpreters at almost all its sites throughout the world. Because it has only six official languages, however, it is a smaller employer than the European Union.
Interpreters may also work as freelance operators in their local, regional and national communities, or may take on contract work under an interpreting business or service. They would typically take on work as described above.
See also 
- Chartered Institute of Linguists
- Institute of Translation & Interpreting
- Interpreting notes
- Machine translation
- New Zealand Society of Translators and Interpreters
- Registry of Interpreters for the Deaf
- Telephone interpreting
- Translation studies
- United Nations Interpretation Service
- List of language interpreters in fiction
- S. Bassnett, Translation studies, p.13-37
- Einesman, F.: "Confessions and Culture: The Interaction of Miranda and Diversity". Page 26, Journal of Criminal Law and Criminology, 1999
- Most non-native speakers of English use the term "sworn interpreter", which is calqued from a civil-law position title common throughout the world. However, there is no common law country[clarification needed] that uses this term.
- Kilgannon, Corey (2005-03-15). "Queens Hospitals Learn Many Ways to Say 'Ah'". The New York Times. pp. B1. Retrieved 2008-04-19.
- "efsli Website". efsli. Retrieved 8/31/2012.
- "DG Interpretation — SCIC".
- Bassnett, Susan (1990). Translation studies. London & New York: Routledge. ISBN 0-415-06528-3.
- Bertone, Laura (2006) The Hidden Side of Babel: Unveiling Cognition, Intelligence and Sense, ISBN 987-21049-1-3 Evolucion, Organización intercultural
- Chuzhakin, Andrei (2007) "Applied Theory of Interpretation and Note-Taking", "Mir Perevoda 1 to 7", Ustny Perevod, Posledovatelny Perevod, Ace Perevoda Mir Perevoda.
- Gillies, Andrew (2005) Note-taking for Consecutive Interpreting, ISBN 1-900650-82-7.
- Jones, Roderick (1998) Conference Interpreting Explained, ISBN 1-900650-57-6.
- Rozan, Jean-François (1956) La Prise de Notes en Interprétation Consécutive, ISBN 2-8257-0053-3.
- Seleskovitch, Danica (1968) L'interprète dans les conférences internationales, Cahiers Champollion.
- Taylor-Bouladon, Valerie (2007) Conference Interpreting — Principles and Practice, 2nd Edition ISBN 1-4196-6069-1.
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- The difference between consecutive and simultaneous interpreting
- What is conference interpreting?
- Collegiate Commission on Interpreter Education
- Science in Sign (Video, 3 min. 48 secs.), by Davis, Leslye & Huang, Jon & Xaquin, G.V.; interpreted by Callis, Lydia, on NYTimes.com website, December 4, 2012. Retrieved December 13, 2012. The video translates a shortened version of a N.Y. Times science article on how new sign language signs are being developed to enhance communication in the sciences, extracted from: