This article may be confusing or unclear to readers. Please help clarify the article; suggestions may be found on the talk page. (July 2011)

Train wreck at Montparnasse, France, 1895

The word error entails different meanings and usages relative to how it is conceptually applied. The concrete meaning of the Latin word "error" is "wandering" or "straying". Unlike an illusion, an error or a mistake can sometimes be dispelled through knowledge (knowing that one is looking at a mirage and not at real water does not make the mirage disappear). For example, a person who uses too much of an ingredient in a recipe and has a failed product can learn the right amount to use and avoid repeating the mistake. However, some errors can occur even when individuals have the required knowledge to perform a task correctly. Examples include forgetting to collect change after buying chocolate from a vending machine, forgetting the original document after making photocopies, and forgetting to turn the gas off after cooking a meal. Some errors occur when an individual is distracted by something else.

Human behavior [link]

One error and its catastrophic results: Napoleon's retreat from Moscow, painted by Adolph Northen in the 19th century

One reference differentiates between "error" and "mistake" as follows:

An 'error' is a deviation from accuracy or correctness. A 'mistake' is an error caused by a fault: the fault being misjudgment, carelessness, or forgetfulness. Now, say that I run a stop sign because I was in a hurry, and wasn't concentrating, and the police stop me, that is a mistake. If, however, I try to park in an area with conflicting signs, and I get a ticket because I was incorrect on my interpretation of what the signs meant, that would be an error. The first time it would be an error. The second time it would be a mistake since I should have known better.^[1]

In human behavior the norms or expectations for behavior or its consequences can be derived from the intention of the actor or from the expectations of other individuals or from a social grouping or from social norms. (See deviance.) Gaffes and faux pas can be labels for certain instances of this kind of error. More serious departures from social norms carry labels such as misbehavior and labels from the legal system, such as misdemeanor and crime. Departures from norms connected to religion can have other labels, such as sin.

Oral and written language [link]

An individual language user's deviations from standard language norms in grammar, syntax, pronunciation and punctuation are sometimes referred to as errors. However in light of the role of language usage in everyday social class distinctions, many feel that linguistics should be descriptive rather than prescriptive to avoid reinforcing dominant class value judgments about what linguistic forms should and should not be used. See also Error analysis.

Herzliya Airport (Israel) Runway location and Traffic pattern chart (left) was erroneously printed as a result of "black layer" 180° misplacement. The corrected chart is on the right.

[edit] Gaffe

A gaffe is a verbal mistake, usually made in a social environment. The mistake may come from saying something that is true, but inappropriate. It may also be an erroneous attempt to reveal a truth. Finally, gaffes can be malapropisms, grammatical errors or other verbal and gestural weaknesses or revelations through body language. Actually revealing factual or social truth through words or body language, however, can commonly result in embarrassment or, when the gaffe has negative connotations, friction between people involved.

As used by some journalists, particularly sportswriters, "gaffe" becomes an imagined synonym for any kind of mistake, e.g., a dropped ball by a player in a baseball game. Philosophers and psychologists interested in the nature of the gaffe include Freud and Gilles Deleuze. Deleuze, in his Logic of Sense, places the gaffe in a developmental process that can culminate in stuttering.

Medicine [link]

See medical error for a description of error in medicine.

Science and engineering [link]

Erroneous traffic sign in Israel. The correct sign is depicted on the lower-right corner.

Indication of an error; one clock not only "stopped". With is 12-o'clock position, it also indicates its failure

In statistics, an error (or residual) is not a "mistake" but rather a difference between a computed, estimated, or measured value and the accepted true, specified, or theoretically correct value. See also Observational error.

In science and engineering in general an error is defined as a difference between the desired and actual performance or behavior of a system or object. This definition is the basis of operation for many types of Control systems, in which error is defined as the difference between a set point and the process value. An example of this would be the thermostat in a home heating system—the operation of the heating equipment is controlled by the difference (the error) between the thermostat setting and the sensed air temperature. Another approach is related to considering a scientific hypothesis as true or false, giving birth to two types or errors: Type 1 and Type 2. The first one is when a true hypothesis is considered false, while the second is the reverse (a false one is considered true).

Engineers seek to design devices, machines and systems and in such a way as to mitigate or preferably avoid the effects of error, whether unintentional or not. Such errors in a system can be latent design errors that may go unnoticed for years, until the right set of circumstances arises that cause them to become active. Other errors in engineered systems can arise due to human error, which includes cognitive bias. Human factors engineering is often applied to designs in an attempt to minimize this type of error by making systems more forgiving or error-tolerant.

(In computational mechanics, when solving a system such as Ax = b there is a distinction between the "error" — the inaccuracy in x — and residual—the inaccuracy in Ax.)

Numerical analysis [link]

Numerical analysis provides a variety of techniques to compute approximations to mathematical numerical values. Errors arise from a trade-off between efficiency and precision, which is limited anyway, since (using floating-point arithmetic) only some rational numbers can be represented exactly. The discrepancy between the exact mathematical value and the computed value is called the approximation error.

Cybernetics [link]

The word cybernetics stems from the Greek Κυβερνήτης (kybernētēs, steersman, governor, pilot, or rudder — the same root as government). In applying corrections to the trajectory or course being steered cybernetics can be seen as the most general approach to error and its correction for the achievement of any goal. The term was suggested by Norbert Wiener to describe a new science of control and information in the animal and the machine. Wiener's early work was on noise.

The cybernetician Gordon Pask held that the error that drives a servomechanism can be seen as a difference between a pair of analogous concepts in a servomechanism: the current state and the goal state. Later he suggested error can also be seen as an innovation or a contradiction depending on the context and perspective of interacting (observer) participants. The founder of management cybernetics, Stafford Beer, applied these ideas most notably in his Viable System Model.

Biology [link]

In biology, an error is said to occur when perfect fidelity is lost in the copying of information. For example, in an asexually reproducing species, an error (or mutation) has occurred for each DNA nucleotide that differs between the child and the parent. Many of these mutations can be harmful, but unlike other types of errors, some are neutral or even beneficial. Mutations are an important force driving evolution. Mutations that make organisms more adapted to their environment increase in the population through natural selection as organisms with favorable mutations have more offspring.

Governmental policy [link]

Within United States government intelligence agencies, such as Central Intelligence Agency agencies, error refers to intelligence error, as previous assumptions that used to exist at a senior intelligence level within senior intelligence agencies, but has since been disproven, and is sometimes eventually listed as unclassified, and therefore more available to the American public and citizenry of the United States. The Freedom of information act provides American citizenry with a means to read intelligence reports that were mired in error. Per United States Central Intelligence Agency's website (as of August, 2008) intelligence error is described as:

"Intelligence errors are factual inaccuracies in analysis resulting from poor or missing data; intelligence failure is systemic organizational surprise resulting from incorrect, missing, discarded, or inadequate hypotheses."^[2]

Numismatics [link]

In numismatics, an error refers to a coin or medal that has a minting mistake, similar to errors found in philately. Because the U.S. Bureau of the Mint keeps a careful eye on all potential errors, errors on U.S. coins are very few and usually very scarce. Examples of numismatic errors: extra metal attached to a coin, a clipped coin caused by the coin stamp machine stamping a second coin too early, double stamping of a coin. A coin that has been overdated, e.g.: 1942/41, is considered an error.

Error correction [link]

This unreferenced section requires citations to ensure verifiability.

Norman (1986, 1988) argued that because error is inevitable, ‘designers’ should minimize the causes of error, make it possible to undo erroneous actions and make it easier to discover and correct errors. Edmondson’s research focuses on pinpointing specific conditions on group levels which can influence the degree of errors caught and corrected. Although her study was in a specific sector (medicine) some of her conditions can be generalized: a) Unit Leader behaviours. b) Unit performance outcomes c) Unit shared beliefs.

Unit leader behaviours are crucial in creating a culture in which openness of discussing errors, through their open and stimulating behaviour, are used as an example for the others. The unit performance outcomes consist of factors such as quality of interpersonal relations, unit performance and detected error rates. The leader behaviour and the performance outcomes result in shared beliefs. The shared beliefs of error report that first of all, everybody should accept that making mistakes is normal and that it will not be used against one (Helmreich, 1988). Further, the more errors are reported and discussed, the bigger the incentive should be to report and solve other errors.

Jones (1999) adds that technocratic movements have a positive influence on error correction due improved communication. Technological improvements stimulate collaborate thinking and striving for optimalization of systems. Through this, error correction is maximalized. Tsuvijek (1988) implies how technology on one hand can improve error correction, but on the other hand cause more errors due to decreased human intervention.

In mathematics, computer science, telecommunication, and information theory, error correction has a very precise meaning discussed in the article about error detection and correction.

See also [link]

• Anomaly in software
• Blooper
• Blunder
• Error analysis
• Howler (error)
• Kinsley gaffe – politician inadvertently speaking the unspeakable truth
• Observational error
• Popular errors
• Refractive error
• Trial and error
• Uncertainty

Psychology of error

• Absent-mindedness
• Freudian slip
• Lapsus

Error in reasoning

• Cognitive bias
• Fallacy

Errors in language

• Faux pas
• Malapropism
• Spoonerism
• Typographical error

Errors on the Web

• Custom error page

Error diagnosis and prevention

• Forensic engineering
• Root cause
• Root cause analysis
• Spell checking
• Swiss cheese model of accident causation in human systems

Production quality terminology

• Defect
• Fault
• Flaw
• Nonconformity

References [link]

External links [link]

Look up error in Wiktionary, the free dictionary.

• Errors contained in reference books – Internet Accuracy Project