effectiveness

Everyday

1. Effectiveness is how well something works or does the job it is meant to do. tree →
2. In science tests, effectiveness is measured by comparing results, for example how well a soap removes dirt. tree →

In the lessons

Science and fair tests (effectiveness of insulators, sun cream, magnets), health (effectiveness of a vaccine or medicine), and in reviewing your own work. Phrases: the effectiveness of, test the effectiveness, improve effectiveness.

Examples

• We tested the effectiveness of three materials at keeping ice cold. tree →
• The effectiveness of the plan surprised everyone. tree →
• Doctors check the effectiveness of medicines in careful trials. tree →
• The coach judged the effectiveness of our new tactic. tree →
• Washing hands with soap has great effectiveness against germs. tree →
• The survey measured the effectiveness of the new reading club. tree →
• A few words unknown to the reader only add effectiveness and local colour to a narrative, as Mr. Kipling well knows. tree →

Note

Uncountable. Effective (works well) vs efficient (works without waste) — different. Affect/effect confusion: effect is the noun, so effectiveness has e. In maths, effectiveness can be shown as a percentage, like «90% effective».