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Hi,

In my dictionary, people say:

performance: how well or badly you do sth, how well or badly sth works.

efficiency: how well or badly you do sth, how well or badly sth works.

So, how can I distinguis them? Are they interchangeable? If not, what is the difference in meaning between them?

Quoc
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Use:

My dictionary says that:

In my dictionary, it is mentioned/indicated/shown that:
They are for the most part interchangeable.

The only difference I would identify is that "performance" tends to be a measure of results only, whereas "efficiency" tends to measure results against resources.

"The car had great performance. It could go very fast."

"The car's efficiency was notable. It went very far on one tank of petrol."
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Tung QuocHi,

In my dictionary, people say:

performance: how well or badly you do sth, how well or badly sth works.

efficiency: how well or badly you do sth, how well or badly sth works.

So, how can I distinguis them? Are they interchangeable? If not, what is the difference in meaning between them?

Quoc

Hi Quoc,

I tend to see it differently. The meaning of “performance” and “efficiency” seem to me are on the different part of the definition scale.

In general terms, a “good performance” is an act or work well done by a person or entity. It has little bearing with the word “efficiency”.

In business terms, if a company or investment portfolio yields better profit or a bigger bottom line than predicted, it’s said to have “excellent performance”. The company may or may not be “efficient”.

In terms of automobiles, they almost mean something entirely opposite.

We most likely won’t find the word “efficient” in the description of a high-performance car such as Porche. Performance – means cornering, speed and agility.

However, the word “performance” is unlikely to be found on the advertisement of a Prius. On the other hand, “fuel efficiency” is splattered everywhere.

Mind you, the meaning of these two words can be subject to interpretation and expectation.

If the mentioned performance is evaluated or judged by the efficiency of it’s components, then a relationship may be formed. But interchangeable? I tend to disagree.
The result of an efficient preparation could be a flawless performance at an exam.
GarnettThey are for the most part interchangeable.

"The car's efficiency was notable. It went very far on one tank of petrol."
I would say they are chalk and cheese.

(I wrote my thesis about the efficiency of heat engines at the univ.)
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I had never taken them as a pair of synonyms until I saw the question.
Inchoateknowledge
GarnettThey are for the most part interchangeable.

"The car's efficiency was notable. It went very far on one tank of petrol."
I would say they are chalk and cheese.

(I wrote my thesis about the efficiency of heat engines at the univ.)
So you never interchanged "efficiency" and "performance"? I'd love to see a full copy of your report...
Hi Anon,

From the tone of your post, I take it that you are on the "interchangeable" column. Is this a correct assumption? What kind of report would you like to see? Just curious....
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