
[Middle English, from Latin agēns, agent-, present participle of agere, to do.]
A software routine that waits in the background and performs an action when a specified event occurs. For example, agents could transmit a summary file on the first day of the month or monitor incoming data and alert the user when a certain transaction has arrived. Agents are also called "intelligent agents," "personal agents" and "bots." See mobile agent, bot and workflow.
Download Computer Desktop Encyclopedia to your PC, iPhone or Android.
Organization or individual authorized to operate on behalf of another organization in exchange for a fee or commission. See also advertising agency; cash field agent; catalog agency; direct-mail agency; paid in advance; paid during service; subscription agency; telephone agency.
| Agency Shop, Agency Disclosure, Agency By Necessity | |
| Agglomeration, Aggregate, Aggregate Income |
| Agency Disclosure, Agency | |
| Agents of Production, Agreement of Sale |
noun
n. in intelligence usage, one who is authorized or instructed to obtain or to assist in obtaining information for intelligence or counterintelligence purposes.
See the Introduction, Abbreviations and Pronunciation for further details.
An active communicating entity that can acquire a role; that is, an abstract representation of a function, service, or identity. Groups of agents represent organizational levels, described by the positions of the agents, and by the patterns of interaction of these positions. These positions are the roles, which do not exist independently, and are linked to a viewpoint of the organizational level. An agent's individual dynamics are brought about by a combination of different roles, which are related to the collective dynamics of the system, and functions and roles at those levels. This formal approach is used in agent-modelling software, which is used to describe and model the social and spatial structures of a real system.
One who is empowered to enter into binding transactions on behalf of another (usually called the principal).
One who acts. The central problem of agency is to understand the difference between events happening in me or to me, and my taking control of events, or doing things. See action, determinism, free will, will.
In general terms, an agent is one authorized to act in place of, or on behalf of, another. An intelligence agent, however, is not simply an agent of or for an intelligence agency. Whereas members of the agency are called intelligence officers, operatives, or special agents, an agent is someone hired or recruited from outside. There are numerous other variations in the informal taxonomy of agents, including secret or undercover agents, agents provocateur, agents-in-place, double agents, and agents of influence.
The distinction between agents and operatives. Intelligence agency employees who work in the field do not call themselves agents; an agent is someone hired or recruited by an intelligence agency to do its bidding. The person to whom the agent reports—the actual agency employee—is known as an operative.
The distinction goes back to World War II and the origins of modern intelligence agencies. At that time, Office of Strategic Services (OSS) manuals defined an operative as "an individual employed by and responsible to the OSS and assigned under special programs to field activity." An agent, on the other hand, was defined by OSS as "an individual recruited in the field who is employed or directed by an OSS operative." The Central Intelligence Agency (CIA), successor to OSS, calls its operatives CIA officers.
There are numerous variations on the term "agent." In the Federal Bureau of Investigation (FBI) under J. Edgar Hoover, operatives called themselves "special agents." By this designation, Hoover meant to distinguish FBI agents from ordinary police officers.
Secret agents, double agents, and agents-in-place. A secret agent or undercover agent is, simply enough, an agent who works in a clandestine capacity, such that the relationship with the intelligence agency is not obvious to those around him or her. These terms are more likely to show up in the vocabulary of laypeople than of intelligence operatives. In fact, such terminology is somewhat redundant, inasmuch as most agents must be secret or undercover in order to function effectively.
More useful are terms such as double agent or agent-in-place. A double agent is someone who seems to serve one intelligence agency, but actually works on behalf of another. Usually these agencies represent enemy governments, and the double agent provides information to one agency about the other or others. If, instead of two agencies, an agent serves three, the term triple agent is used. The double or triple agent may even be providing information to each service about the others, but usually there is only one entity that the double agent truly or ultimately serves.
A double agent whose perfidy has been discovered by the agency against which he or she is spying, and who is then used in that agency's service against the other, is a redoubled agent. An agent may be forced against his or her will to become a double agent. The same is true of a redoubled agent, a role an agent can assume without even knowing that he or she is doing so—for example, by being given inaccurate or deliberately deceptive material to pass on as genuine intelligence.
An agent-in-place is similar to a double agent, with the difference that, whereas a double agent is usually called upon by agency to take that role, the agent-in-place usually volunteers for the position. Suppose a person works for Agency A, then is sent to work for agency B so as to report information to Agency A without anyone at Agency B knowing. That is a double agent. On the other hand, an agent-in-place would be someone working for Agency B who, of his or her own initiative, offered services to Agency A. The agent would continue to work for Agency B, and feed information to Agency A.
An agent-in-place is extremely valuable to the employing agency, but his or her role has great risks. For agents in place working on behalf of America's enemies—for example, Robert Hanssen, the FBI special agent who sold secrets to the Soviets and later the Russians—discovery led to imprisonment. For agents-in-place working on behalf of America in the Soviet camp, the penalty for discovery was far worse. According to an anecdote reported by Henry Becket, when KGB officers discovered that one of their own was serving the Americans as an agent-in-place, he was thrown feet first into a roaring furnace while his colleagues watched.
Sleepers, provocateurs, and agents of influence. Several other interesting variations on the concept of an agent are sleeper agents, agents provocateur, and agents of influence. A sleeper agent is one placed in an undercover situation and told to await further instructions before beginning to actively engage in espionage activities. A sleeper may remain inactive for months or years, or even the rest of his or her life.
An agent provocateur is someone who infiltrates a group or organization with the purpose of inciting its members to unlawful acts that would bring them to the attention of—and most likely cause them to receive punishment from—authorities. Agents provocateur in labor organizations of the late nineteenth or early twentieth centuries, for instance, instigated mob violence that brought police action against workers' groups.
Finally, an agent of influence is someone who does not directly work for an intelligence agency, but is willing to act on its behalf. For example, right-leaning American intellectuals during the mid-twentieth century who worked for the Congress of Cultural Freedom, a CIA-sponsored group intended to influence western European opinion during the Cold War, often knowingly acted as agents of influence for U.S. intelligence. At the same time, many left-leaning Western intellectuals who were fed Soviet propaganda or disinformation, and who disseminated that material as truth, unwittingly acted as agents of influence for the KGB.
Further Reading
Books
Bennett, Richard M. Espionage: An Encyclopedia of Spies and Secrets. London: Virgin Books, 2002.
Nash, Jay Robert. Spies: A Narrative Encyclopedia of Dirty Deeds and Double Dealing from Biblical Times to Today. New York: M. Evans, 1997.
Richelson, Jeffrey T. The U.S. Intelligence Community, fourth edition. Boulder, CO: Westview Press, 1999.
Term in parapsychology to denote the individual who attempts to communicate information to a percipient, or subject, of extrasensory perception.
1. An individual or firm that places securities transactions for clients.
2. A person licensed by a state to sell insurance.
3. A securities salesperson who represents a broker-dealer or issuer when selling or trying to sell securities to the investing public.
Investopedia Says:
Essentially, this is the person who makes a transaction on behalf of his or her employer or client.
Related Links:
How do you find the right broker for your investment needs? Start by reading our broker tutorial. Brokers and Online Trading
Few careers match the opportunity for as quick and large a paycheck as does being a life insurance agent. Becoming An Insurance Agent
This important investment decision happens before you pick your first stock. Find out how to get it right. 10 Tips For Choosing An Online Broker
Keeping thorough records and knowing the penalties make this experience easier than you'd expect. Surviving The IRS Audit
Breaking into the finance business is tough, but these tips can help. Students, Get Your Foot In The Door!
(DOD) In intelligence usage, one who is authorized or instructed to obtain or to assist in obtaining information for intelligence or counterintelligence purposes.
A telescope will magnify a star a thousand times, but a good press agent can do even better.
— Fred Allen
LearnThatWord.com is a free vocabulary and spelling program where you only pay for results!
Quotes:
"O world, world! thus is the poor agent despised. O traitors and bawds, how earnestly are you set a-work, and how ill requited! Why should our endeavor be so loved, and the performance so loathed?"
- William Shakespeare
"Let every eye negotiate for itself and trust no agent."
- William Shakespeare
"If God had an agent, the world wouldn't be built yet. It'd only be about Thursday."
- Jerry Reynolds
"It is well-known what a middleman is: he is a man who bamboozles one party and plunders the other."
- Benjamin Disraeli
"Throughout the history of commercial life nobody has ever quite liked the commission man. His function is too vague, his presence always seems one too many, his profit looks too easy, and even when you admit that he has a necessary function, you feel that this function is, as it were, a personification of something that in an ethical society would not need to exist. If people could deal with one another honestly, they would not need agents."
- Raymond Chandler
"The agent never receipts his bill, puts his hat on and bows himself out. He stays around forever, not only for as long as you can write anything that anyone will buy, but as long as anyone will buy any portion of any right to anything that you ever did write. He just takes ten per cent of your life."
- Raymond Chandler
See more famous quotes about Agents
1. any power, principle or substance by which something is accomplished, or which is capable of producing a chemical, physical or biological effect such as a disease.
2. of disease; any factor whose excessive presence or relative absence is essential for the occurrence of a disease.
1. a person or product that causes action. n 2. a person authorized to act for, or in place of, another.

|
|
This article needs attention from an expert on the subject. Please add a reason or a talk parameter to this template to explain the issue with the article. WikiProject Robotics or the Robotics Portal may be able to help recruit an expert. (October 2009) |
In artificial intelligence, an intelligent agent (IA) is an autonomous entity which observes through sensors and acts upon an environment using actuators (i.e. it is an agent) and directs its activity towards achieving goals (i.e. it is rational).[1] Intelligent agents may also learn or use knowledge to achieve their goals. They may be very simple or very complex: a reflex machine such as a thermostat is an intelligent agent,[2] as is a human being, as is a community of human beings working together towards a goal.
Intelligent agents are often described schematically as an abstract functional system similar to a computer program. For this reason, intelligent agents are sometimes called abstract intelligent agents (AIA)[citation needed] to distinguish them from their real world implementations as computer systems, biological systems, or organizations. Some definitions of intelligent agents emphasize their autonomy, and so prefer the term autonomous intelligent agents. Still others (notably Russell & Norvig (2003)) considered goal-directed behavior as the essence of intelligence and so prefer a term borrowed from economics, "rational agent".
Intelligent agents in artificial intelligence are closely related to agents in economics, and versions of the intelligent agent paradigm are studied in cognitive science, ethics, the philosophy of practical reason, as well as in many interdisciplinary socio-cognitive modeling and computer social simulations.
Intelligent agents are also closely related to software agents (an autonomous software program that carries out tasks on behalf of users). In computer science, the term intelligent agent may be used to refer to a software agent that has some intelligence, regardless if it is not a rational agent by Russell and Norvig's definition. For example, autonomous programs used for operator assistance or data mining (sometimes referred to as bots) are also called "intelligent agents".
|
Contents
|
Intelligent agents have been defined many different ways.[3] According to Nikola Kasabov[4] IA systems should exhibit the following characteristics:
A simple agent program can be defined mathematically as an agent function[5] which maps every possible percepts sequence to a possible action the agent can perform or to a coefficient, feedback element, function or constant that affects eventual actions:

Agent function is an abstract concept as it could incorporate various principles of decision making like calculation of utility of individual options, deduction over logic rules, fuzzy logic, etc.[6]
The program agent, instead, maps every possible percept to an action.
We use the term percept to refer to the agent's perceptional inputs at any given instant. In the following figures an agent is anything that can be viewed as perceiving its environment through sensors and acting upon that environment through actuators.
Russell & Norvig (2003) group agents into five classes based on their degree of perceived intelligence and capability:[7]
Simple reflex agents act only on the basis of the current percept, ignoring the rest of the percept history. The agent function is based on the condition-action rule: if condition then action.
This agent function only succeeds when the environment is fully observable. Some reflex agents can also contain information on their current state which allows them to disregard conditions whose actuators are already triggered.
Infinite loops are often unavoidable for simple reflex agents operating in partially observable environments. Note: If the agent can randomize its actions, it may be possible to escape from infinite loops.
A model-based agent can handle a partially observable environment. Its current state is stored inside the agent maintaining some kind of structure which describes the part of the world which cannot be seen. This knowledge about "how the world works" is called a model of the world, hence the name "model-based agent".
A model-based reflex agent should maintain some sort of internal model that depends on the percept history and thereby reflects at least some of the unobserved aspects of the current state. It then chooses an action in the same way as the reflex agent.
Goal-based agents further expand on the capabilities of the model-based agents, by using "goal" information. Goal information describes situations that are desirable. This allows the agent a way to choose among multiple possibilities, selecting the one which reaches a goal state. Search and planning are the subfields of artificial intelligence devoted to finding action sequences that achieve the agent's goals.
In some instances the goal-based agent appears to be less efficient; it is more flexible because the knowledge that supports its decisions is represented explicitly and can be modified.
Goal-based agents only distinguish between goal states and non-goal states. It is possible to define a measure of how desirable a particular state is. This measure can be obtained through the use of a utility function which maps a state to a measure of the utility of the state. A more general performance measure should allow a comparison of different world states according to exactly how happy they would make the agent. The term utility, can be used to describe how "happy" the agent is.
A rational utility-based agent chooses the action that maximizes the expected utility of the action outcomes- that is, the agent expects to derive, on average, given the probabilities and utilities of each outcome. A utility-based agent has to model and keep track of its environment, tasks that have involved a great deal of research on perception, representation, reasoning, and learning.
Learning has an advantage that it allows the agents to initially operate in unknown environments and to become more competent than its initial knowledge alone might allow. The most important distinction is between the "learning element", which is responsible for making improvements, and the "performance element", which is responsible for selecting external actions.
The learning element uses feedback from the "critic" on how the agent is doing and determines how the performance element should be modified to do better in the future. The performance element is what we have previously considered to be the entire agent: it takes in percepts and decides on actions.
The last component of the learning agent is the "problem generator". It is responsible for suggesting actions that will lead to new and informative experiences.
According to other sources[who?], some of the sub-agents (not already mentioned in this treatment) that may be a part of an Intelligent Agent or a complete Intelligent Agent in themselves are:
To actively perform their functions, Intelligent Agents today are normally gathered in a hierarchical structure containing many “sub-agents”. Intelligent sub-agents process and perform lower level functions. Taken together, the intelligent agent and sub-agents create a complete system that can accomplish difficult tasks or goals with behaviors and responses that display a form of intelligence.[citation needed]
Intelligent agents are applied as automated online assistants, where they function to perceive the needs of customers in order to perform individualized customer service. Such an agent may basically consist of a dialog system, an avatar, as well an expert system to provide specific expertise to the user.[8]
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Dansk (Danish)
n. - agent, stedfortræder
idioms:
Nederlands (Dutch)
tussenpersoon, spion, impresario, middel
Français (French)
n. - (Comm) agent, représentant, concessionnaire, (Ling) agent
idioms:
Deutsch (German)
n. - Vertreter, Agent, Vermittler
idioms:
Ελληνική (Greek)
n. - αντιπρόσωπος, πράκτορας, μυστικός πράκτορας, μεσολαβητής, μεσάζων, μεσίτης, ατζέντης, (φυσ.) μέσον, άγων, παράγων, συντελεστής, (γραμμ.) ποιητικό αίτιο
idioms:
Italiano (Italian)
agente, manager, mediatore, rappresentante, amministratore
idioms:
Português (Portuguese)
n. - agente (m) (f), representante (m) (f), bilheteiro (m), reagente (m) (Quím.), corretor (m)
idioms:
Русский (Russian)
агент, представитель, менеджер, агент по недвижимости, посол, администратор
idioms:
Español (Spanish)
n. - agente, representante, empresario, comisionista, intermediario, gestor, enviado, administrador
idioms:
Svenska (Swedish)
n. - agent, ombud, medel
中文(简体)(Chinese (Simplified))
代理人, 仲介人, 代理商, 间谍, 特工, 密探
idioms:
中文(繁體)(Chinese (Traditional))
n. - 代理人, 仲介人, 代理商, 間諜, 特務, 密探
idioms:
한국어 (Korean)
n. - 대리인, 중개인, 외무판매원, 스파이, 사무관
日本語 (Japanese)
n. - 代行者, 代理人, 代理業者, 政府職員, 諜報員, 動因, 動作主, エージェント, 手先, 自然力
idioms:
العربيه (Arabic)
(الاسم) عامل, قوه, موظف, أداه, وسيله, وكيل
עברית (Hebrew)
n. - סוכן, נציג, גורם, כוח
If you are unable to view some languages clearly, click here.