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Effectiveness or effectivity Effectiveness vs. Efficacy vs. Efficiency – Differences | Dictionary.com. is the capability of producing a desired result or the ability to produce desired output. When something is deemed effective, it means it has an intended or expected outcome, or produces a deep, vivid impression.Dictionary.com, LLC. "Effectiveness | Define Effectiveness Dictionary.com." Dictionary.com | Find the Meanings and Definitions of Words at Dictionary.com. 2011. Web. 28 Sept. 2011.
In group theory, a group element acts effectively (or faithfully) on a point, if that point is not fixed by the action.
In heat transfer, effectiveness is a measure of the performance of a heat exchanger when using the NTU method.
In human–computer interaction, effectiveness is defined as "the accuracy and completeness of users' tasks while using a system".DIN EN ISO 9241-11. Ergonomic Requirements for office with visual display terminals – Guidance on usability. Beuth, Berlin (1998)
In military science, effectiveness is a criterion used to assess changes determined in the target system, in its behavior, capability, or assets, tied to the attainment of an end state, achievement of an objective, or creation of an effect,Commander’s Handbook for Strategic Communication and Communication Strategy, US Joint Forces Command, 2010. while combat effectiveness is: "...the readiness of a military unit to engage in combat based on behavioral, operational, and leadership considerations. Combat effectiveness measures the ability of a military force to accomplish its objective and is one component of overall military effectiveness."" Combat effectiveness". Encyclopaedia Britannica. 24 Jan. 2019."Combat Effectiveness"
Other synonyms for effectiveness include: clout, capability, success, weight, performance.STANDS4 LLC. "Effectiveness Synonym." Synonyms.net. 2011. Web. 28 Sept. 2011.
Simply stated, effective means achieving an effect, and efficient means getting a task or job done it with little waste. To illustrate: suppose, you build 10 houses, very fast and cheap (efficient), but no one buy them. In contrary to building 5 houses same budget and time as 10 houses but you get all 5 sold and the buyers are happy (effective). You get the desired result selling your houses and happy customers (effect).
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Related terms
Efficacy, efficiency, and effectivity are terms that can, in some cases, be interchangeable with the term effectiveness. The word effective is sometimes used in a quantitative way, "being very effective or not very effective". However, neither "effectiveness", nor "effectively", inform about the direction (positive or negative) or gives a comparison to a standard of the given effect. Efficacy, on the other hand, is the extent to which a desired effect is achieved; the ability to produce a desired amount of the desired effect, or the success in achieving a given goal. Contrary to the term efficiency, the focus of efficacy is the achievement as such, not the resources spent in achieving the desired effect. Therefore, what is effective is not necessarily efficacious, and what is efficacious is not necessarily efficient.Longman, Pearson. "Effective - Definition from Longman English Dictionary Online." Longman English Dictionary Online. 2011. Web. 04 Oct. 2011.
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