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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".


Fidelity also denotes how accurate a copy is to 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", doesn't 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's 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". 
  2. ^ Hays, R.; Singer, M. (1989). Simulation fidelity in training system design: Bridging the gap between reality and training. Springer-Verlag. 
  3. ^ O’Donnell, Carol (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. Retrieved March 6, 2010. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Fidelity — Please support Wikipedia.
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8047781 news items


Tue, 18 Nov 2014 21:27:17 -0800

Photo: Pete Kiehart / The Chronicle Sean Belka, head of Fidelity Labs, poses for a portrait wearing an Oculus Rift headset, which can be used to view the company's new product StockCity, at Fidelity Investments on November 18, 2014 in San Francisco, Calif.


Fri, 21 Nov 2014 12:03:45 -0800

SAN FRANCISCO — Financial planning often involves lots of spreadsheets, pie charts and eyes glazing over. Fidelity Investments aims to change that equation with an experiment in 3D technology designed to make money management seem more like a ...

American Banker (subscription)

American Banker (subscription)
Fri, 21 Nov 2014 15:03:45 -0800

Millennial women are making great strides in the workforce still "channel their inner ninth grade insecure freshman when it comes to financial matters," according to Fidelity's head of personal investing. To continue, please log in, register or ...
Fri, 21 Nov 2014 12:58:53 -0800

As digital music streaming services continue to fight it out, the development I'm watching most carefully is the future of high fidelity: full-resolution files equal or better than CDs, coming to our phones and desktops. A new streaming service, TIDAL ...
Boston Globe
Tue, 11 Nov 2014 18:32:47 -0800

Fidelity Investments, best known for mutual funds and retirement plans, now oversees more in charitable contributions than much better-known philanthrophic organizations such as the Salvation Army and the American Red Cross, and it is on the verge of ...

Boston Globe

Boston Globe
Mon, 10 Nov 2014 21:08:13 -0800

Danoff recently marked his 24th anniversary as the manager of Fidelity Contrafund, the kind of tenure rarely seen in the mutual fund business. Despite his current frustrations, Contrafund's 2014 performance trails its benchmark Standard & Poor's 500 ...
StreetInsider.com (subscription)
Fri, 21 Nov 2014 03:48:45 -0800

Topeka Capital initiated coverage on Fidelity National Information Services (NYSE: FIS) with a Hold rating and a price target of $61.00. Analyst John T. Williams said, "Following a strong multi-year run, we view the shares as fully valued and believe ...
Financial Advisor Magazine
Fri, 21 Nov 2014 10:56:15 -0800

“We're seeing that the conversation between plan sponsors and advisors is starting to change,” says Jordan Burgess, senior vice president, head of defined contribution investment sales at Fidelity Financial Advisors Solutions. “While fiduciary ...

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