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For other uses, see Fidelity (disambiguation).
Palazzo Ducale in Venice: capital # 28 in the porch, featuring Virtues and vices - In fidelitate nulli gero (Fidelity)

Fidelity is the quality of being faithful or loyal. Its original meaning regarded duty in a broader sense than the related concept of fealty. Both derive from the Latin word fidēlis, meaning "faithful or loyal". In the City of London financial markets it has traditionally been used in the sense encompassed in the motto "My word is my bond".


Fidelity also denotes how accurately a copy reproduces its source. For example, a worn gramophone record will have a lower fidelity than one in good condition, and a recording made by a low budget record company in the early 20th century is likely to have significantly less audio fidelity than a good modern recording. In the 1950s, the terms "high fidelity" or "hi-fi" were popularized for equipment and recordings which exhibited more accurate sound reproduction. The converse term "lo-fi", does not necessarily mean "low fidelity", rather that the production ethic aims for "gritty authenticity" over perfect production. Similarly in electronics, fidelity refers to the correspondence of the output signal to the input signal, rather than sound quality, as in the popular internet connection technology "Wi-Fi".

Scientific modelling and simulation[edit]

In the fields of scientific modelling and simulation, fidelity refers to the degree to which a model or simulation reproduces the state and behaviour of a real world object, feature or condition. Fidelity is therefore a measure of the realism of a model or simulation.[1] Simulation fidelity has also been described in the past as "degree of similarity".[2]

Program evaluation[edit]

In the field of program evaluation, the term fidelity denotes how closely a set of procedures were implemented as they were supposed to have been. For example, it is difficult to draw conclusions from a study about formative assessment in school classrooms if the teachers are not able or willing to follow the procedures they received in training.[3]


  1. ^ "SISO-REF-002-1999: Fidelity Implementation Study Group Report". Simulation Interoperability Standards Organization. 1999. Retrieved January 2, 2015. 
  2. ^ Hays, R. T.; Singer, M. J. (1989). Simulation fidelity in training system design: Bridging the gap between reality and training. Springer-Verlag. 
  3. ^ O'Donnell, Carol L. (2008). "Defining, Conceptualizing, and Measuring Fidelity of Implementation and Its Relationship to Outcomes in K–12 Curriculum Intervention Research". Review of Educational Research 78 (1): 33–84. doi:10.3102/0034654307313793. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Fidelity — Please support Wikipedia.
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9418574 news items

Huffington Post

Huffington Post
Thu, 26 Mar 2015 09:07:30 -0700

"High Fidelity" was released on March 28, 2000. Based on Nick Hornby's beloved book of the same name, it's often cited as one of the better romantic comedies of the 2000s. (The film owns a sparkling 91 percent Fresh rating on Rotten Tomatoes.) But time ...

Kiplinger Personal Finance

Kiplinger Personal Finance
Fri, 27 Mar 2015 12:01:50 -0700

Fidelity is a popular name with retirement savers. According to Brightscope, a company that rates retirement plans, Fidelity funds account for the second-greatest share of all 401(k) assets after Vanguard—and for good reason. The Boston-based firm ...


Wed, 25 Mar 2015 08:25:49 -0700

Last week, Fidelity, one of the largest retirement account administrators in the U.S., reported that the number of people who had 401(k)s worth more than $1 million had more than doubled last year. That followed a study last year by Fidelity about ...


Thu, 26 Mar 2015 02:46:35 -0700

(Bloomberg) -- China raised an investment quota for a foreign fund-management company to a level that exceeds a previously announced cap, signaling a relaxation that would broaden access to its capital markets. Fidelity Investments Management (Hong ...

Consequence of Sound

Consequence of Sound
Mon, 23 Mar 2015 20:56:15 -0700

High Fidelity is an entirely different type of story. Released 15 years ago this week, director Stephen Frears' big-screen adaptation of Nick Hornby's 1995 novel centers on the lowliest, least heroic characters in the rock 'n' roll universe: record ...
Fri, 20 Mar 2015 19:48:45 -0700

Among them is Fidelity Investments' senior vice president of digital solutions, Stuart Rubinstein. He thinks that “wearables are the ultimate notification device. The watch, whether Apple's or another's, can give you subtle updates about the market ...

Mondaq News Alerts (registration)

Thu, 26 Mar 2015 09:18:52 -0700

The United States District Court for the District of Massachusetts dismissed an Employee Retirement Income Security Act (ERISA) complaint filed by participants in retirement plans administered by Fidelity Investments who claimed Fidelity improperly ...


Wed, 25 Mar 2015 15:52:30 -0700

Developing its strategy for a digital platform, Fidelity sought feedback on how to build it and what the final product should look like. But repeatedly, Fidelity says, they were given another suggestion: consider eMoney Advisor. “We had been working on ...

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