effectiveness, efficiency and efficacy

będziesz miał "3 xE" ;)

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efektywny
1. «dający dobre wyniki, wydajny» - http://sjp.pwn.pl/slowniki/efektywność.html

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The ability to produce a desired or intended result - https://en.oxforddictionaries.com/definition/us/efficacy

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What is efficacy? Definition and meaning
Efficacy means the same as effectiveness in most cases – the ability to produce an intended or desired result. The term is commonly used when talking about a medical treatment, a medication, a vaccine, or a plan. Before a company decides on implementing proposed changes, it should evaluate their efficacy in producing results. - http://marketbusinessnews.com/financial-glossary/efficacy-de...

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Note added at 1 hr (2016-09-18 15:07:23 GMT)
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Effectiveness, Efficiency and Efficacy

published in: Leadership
29 Apr 2010

The issue of effectiveness is second in frequency among the themes discussed with some of the readers of Academy for leaders. There are three closely related words on the topic: Effectiveness, Efficiency and Efficacy


Effectiveness is doing "the right" things, i.e. setting right targets to achieve an overall goal (the effect). In his book “The Effective Manager” Peter Drucker claims that effectiveness is a very important discipline which “can be learned and must be learned.” effectiveness, efficiency, efficacy, leader We could easily learn what the right things are. But this is not enough to be effective. As Nicholay Haitov said in "Men Times" – it’s one thing to wish (know), another - to be capable of doing it and third and fourth - to do it. Most important is the fourth - to do it. Effectiveness is not a destination, it is a journey. We will always need to find the right things and we will always have to do them. Our success will be measured by our results, not by our plans, intentions or promises.


Efficiency is doing things in the most economical way (good input to output ratio). Some colleagues do their job with 300 telephone calls and in 900 minutes, while others do the same job with 500 calls and 2000 minutes.

And the last word in the category is Efficacy. Efficacy is getting things done, i.e. meeting targets. Efficacy is the ability to produce a desired amount of the desired effect, or success in achieving a given goal. Contrary to efficiency, the focus of efficacy is the achievement as such, not the resources spent in achieving the desired effect.

http://www.academy-for-leaders.com/blog/post/80