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Efficacy, effectiveness, efficiency

Efficacy, effectiveness, efficiency

These terms sound very similar and are often used interchangeably in everyday conversations.

  • Efficacy means getting stuff done. (Related question: Is it working?)
  • Effectiveness means doing the right things. (Is it working well?)
  • Efficiency means doing things right. (Is it working in the most economical way?)

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Efficacy is mostly used in a scientific setting. Efficacy is the ability to create an anticipated effect.

Efficacy is not always enough. Medication that improves a patient's symptoms under ideal conditions is technically getting things done, but not always the right things.

Once you find an effective solution, you can try to improve it, or make it more efficient.

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