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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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28726 news items

Cantech Letter

Mon, 25 Aug 2014 12:52:30 -0700

HootSuite Media, the Vancouver-based brand management social media system, is apparently on the verge of landing an investment from Fidelity Investments that could pave the way for the company to go public. This is according to a report from The Wall ...


Mon, 18 Aug 2014 16:15:00 -0700

Last year a group of current and former employees sued the retirement plan provider, alleging that the company's employee plan was dominated by higher-cost Fidelity mutual funds when lower-fee options were available -- both within Fidelity's own ...
Tue, 12 Aug 2014 11:49:12 -0700

In a July 3 filing with the U.S. District Court for the District of Massachusetts, Fidelity's parent company, FMR, agreed to pay out $12 million and to implement a slate of changes to its retirement plan. The firm will present its workers with a ...

Boston Globe

Boston Globe
Thu, 14 Aug 2014 21:03:55 -0700

It was an unusual sight: 180 Fidelity Investments mutual fund managers, stock analysts, and traders applying their trademark seriousness to garden beds and gymnasium walls. Chris Bartel, head of global equity research, wielded a circular saw, while ...

Wall Street Journal

Wed, 27 Aug 2014 09:26:17 -0700

Backing came from Fidelity Investments and Wellington Management, according to a person familiar with the situation, underscoring the increasing eagerness of mutual funds to take stakes in the largest private companies well before potential initial ...
Mon, 25 Aug 2014 12:07:30 -0700

Analysts and commentators have speculated that the outflows may suggest that Fidelity has fallen victim to a trend favoring passive investing that has contributed to the Vanguard Group's growing to nearly $3 trillion in assets for the first time. (That ...


Tue, 12 Aug 2014 04:03:00 -0700

Fidelity Investments operates some of the most popular mutual funds on the market. And the best Fidelity mutual funds and Fidelity index funds are, thankfully, very easy to access for most investors. Fidelity 7 Best Fidelity Mutual Funds for Retirement ...


Boston Globe
Wed, 20 Aug 2014 12:18:10 -0700

Just 17 percent of Massachusetts parents intend to pay all college costs for their children, the lowest in the three years Fidelity has asked the question. Six percent said they don't plan to pay for any college costs, and 77 percent expect to pay a ...

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