What context can I use each word in?
Learn when and how to use these words with these examples!
effectiveness
Example
The effectiveness of this new medication has been proven in clinical trials. [effectiveness: noun]
Example
We need to measure the effectiveness of our marketing campaign to see if it's working. [effectiveness: noun]
efficacy
Example
The efficacy of this new vaccine has been demonstrated in laboratory tests. [efficacy: noun]
Example
We need to assess the efficacy of this new teaching method before implementing it. [efficacy: noun]
Good things to know
Which word is more common?
Effectiveness is more commonly used than efficacy in everyday language and covers a wider range of contexts. Efficacy is more commonly used in technical or scientific contexts, particularly in fields such as medicine, research, and development.
Whatโs the difference in the tone of formality between effectiveness and efficacy?
Efficacy is generally considered more formal than effectiveness, as it is often used in technical or scientific contexts where precision and accuracy are important. However, both words can be used in formal or informal settings depending on the context and audience.
