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Home > Language > Words > Efficiency and Effectiveness Compared

Difference Between Efficiency and Effectiveness

Efficiency vs Effectiveness

Efficiency and Effectiveness are two words that are often confused when it comes to their meanings and connotations. Strictly speaking, there is some difference between the two words. The word ‘efficiency’ is used in the sense of ‘competence’, and the word ‘effectiveness’ is used in the sense of ‘usefulness’. This is the main difference between the two words.

Observe the two sentences:

1. The efficiency of the procedure is lauded by one and all.

2. He has shown a lot of efficiency in his singing.

In both the sentences, you can see that the word ‘efficiency’ is used in the sense of ‘competence’ and hence, the meaning of the first sentence would be ‘the competence of the procedure is lauded by one and all’, and the meaning of the second sentence would be ‘he has shown a lot of competence in his singing’.

Observe the two sentences:

1. The effectiveness of the medicine is realized.

2. You will have to understand the effectiveness of HTML.

In both the sentences, you can find that the word ‘effectiveness’ is used in the sense of ‘usefulness’ and hence, the meaning of the first sentence would be ‘the usefulness of the medicine is realized’, and the meaning of the second sentence would be ‘you will have to understand the usefulness of HTML’.

The word ‘efficiency’ is used as a noun and its adjectival form is ‘efficient’ and the word ‘effectiveness’ is also used as a noun and its adjectival form is ‘effective’. It is important to know that the word ‘efficiency’ is often followed by the preposition ‘of’. On the other hand, the word ‘effectiveness’ is also followed by the preposition ‘of’. The word ‘effectiveness’ is often equated to the word ‘efficacy’ in terms of meaning. These are the differences between efficiency and effectiveness.


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