Types of Language interpretation
Conference
Conference interpreting refers to interpretation at a conference or large meeting, either simultaneously or consecutively. The advent of multi-lingual meetings has reduced the amount of consecutive interpretation in the last 20 years.
Conference interpretation is divided between two markets: institutional and private. International institutions (EU, UN, EPO, et cetera), which hold multilingual meetings, often favor interpreting several foreign languages into the interpreters' mother tongues. Local private markets tend to have bilingual meetings (the local language plus another), and the interpreters work both into and out of their mother tongues. These markets are not mutually exclusive. The International Association of Conference Interpreters (AIIC) is the only worldwide association interpreter of conference interpreters. Founded in 1953, its membership includes more than 2,800 professional conference interpreters, in more than 90 countries.
Judicial
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. In a legal context, where ramifications of misinterpretation may be dire, accuracy is paramount. Teams of two or more interpreters, with one actively interpreting and the second monitoring for greater accuracy, may be deployed.

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.This has been especially controversial in cases where illegal immigrants with no English skills are accused of crimes.

In the US, 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 evidence. Incompetent interpretation, or simply failure to swear in the interpreter, can lead to a mistrial.

Escort interpreter

In escort interpreting, an interpreter accompanies a person or a delegation on a tour, on a visit, or to a business meeting or interview. An interpreter in this role is called an escort interpreter or an escorting interpreter. An escort interpreter’s work session may run for days, weeks, or even months, depending on the period of the client’s visit. This type of interpreting is often needed in business contexts, during presentations, investor meetings, and business interpreter negotiations. As such, and escort interpreter needs to be equipped with some business and financial knowledge in order to best understand and convey messages back and forth.
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
Medical interpreting is a subset of public service interpreting, consisting of communication among Healthcare personnel and the patient and their family or among Healthcare 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. Depending on country/state specific requirements, the interpreter is often required to have some knowledge of medical terminology, common procedures, the patient interview and exam process. Medical interpreters are often 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 Healthcare background rarely receive accreditation for medical translation in the medical community. Interpreters working in the Healthcare setting may be considered Allied Health Professionals.

In the United States, however, providing a Medical Interpreter is required by law. Title VI of the Civil Rights Act of prohibits discrimination on the basis of race, color, or national origin in any program or activity that receives Federal funds or other Federal financial assistance. Because hospitals are federally funded, they are required by this law to provide a professional interpreter to any patient that may need one.
Telephone
Also referred to as "over-the-phone interpreting," "telephonic interpreting," and "tele-interpreting," telephone interpreting enables interpretation via telephone. Telephone interpreting can be used in community settings as well as conference settings. Telephone interpreting may be used in place of on-site interpreting when no on-site interpreter is readily available at the location where services are needed. However, it is more commonly used for situations in which all parties who wish to communicate are already speaking to one another via telephone (e.g. telephone applications for insurance or credit cards, or telephone inquiries from consumers to businesses).
On-site
Also called "in-person interpreting" or sometimes colloquialized as "face-to-face", 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.
Video
Interpretation services via Video Remote Interpreting (VRI) or a Video Relay Service (VRS) are useful for spoken language barriers where visual-cultural recognition is relevant, and even more applicable where one of the parties is deaf, hard-of-hearing or speech-impaired (mute). In such cases the direction of interpretation is normally within the same interpreter principal language, such as French Sign Language (FSL) to spoken French and Spanish Sign Language (SSL) to spoken Spanish. 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.

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