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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. 

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779408 news items


Wed, 22 Oct 2014 12:42:53 -0700

Steve Wymer, who runs the $41 billion Fidelity Growth Company Fund disclosed reducing his stake in Herbalife in a third-quarter commentary letter released this week. Wymer's fund is a long-time investor in Herbalife, counting it as a top 10 holding in ...

Boston Globe

Boston Globe
Sat, 18 Oct 2014 21:29:14 -0700

WASHINGTON — Abigail P. Johnson, the billionaire president and CEO of Fidelity Investments, epitomizes the quiet, old-money side of the Boston mutual fund world. With her understated, publicity-shy manner, messy Washington politics would not seem to ...

New York Times

New York Times
Wed, 15 Oct 2014 06:08:40 -0700

Fidelity Investments appears not to be taking offense. It announced Wednesday that it would team up with Betterment and encourage Fidelity-affiliated financial advisers to use its service. The move follows a revelation this week that a firm affiliated ...
Wed, 22 Oct 2014 21:30:00 -0700

based Facebook, which is building a $1 billion data center in Altoona, and Fidelity & Guaranty Life, which moved its headquarters to Des Moines last year. Other winners are Produce Innovations, Norbert Dentressangle, LightEdge Solutions, IP Pathways ...


Tue, 21 Oct 2014 08:45:00 -0700

As the promise of harnessing the immune system to fight cancer grabs headlines around the industry, venture stalwarts Fidelity Biosciences and Atlas Venture have teamed up to launch Unum Therapeutics, a Cambridge, MA, startup with a hybrid approach to ...


Mon, 13 Oct 2014 12:22:43 -0700

Long thought to be the heir-apparent of asset management giant Fidelity, Abigail Johnson is replacing her father, Edward “Ned” Johnson III, as the company's CEO. “Abby Johnson has agreed to become Chief Executive Officer of Fidelity, reflecting a ...


Wed, 22 Oct 2014 12:52:30 -0700

Fidelity & Guaranty Life, an insurance company that moved its headquarters to Des Moines last year, is also a winner. Other winners include Produce Innovations, Norbert Dentressangle, LightEdge Solutions, IP Pathways and Dee Zee Inc. The Partnership ...


Boston Business Journal (blog)
Tue, 21 Oct 2014 03:07:30 -0700

Danoff, the manager of Fidelity Investments' $108 billion Contrafund, loaded up on Facebook stock in the quarter that ended Sept. 30, padding his position in the social media company by a net 6 million shares. That left Contra with about 42 million ...

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