The degree to which objectives are achieved and desired results are accomplished, focusing on doing the right things rather than just doing things efficiently. It measures the quality and impact of outcomes relative to intended goals.
From Latin 'effectivus' (having the power to produce effects), entering English in the 17th century. The business distinction between efficiency (doing things right) and effectiveness (doing the right things) was popularized by management theorist Peter Drucker in the 1960s.
Effectiveness trumps efficiency every time—it's better to be slow at the right thing than fast at the wrong thing. Many companies optimize for efficiency (cutting costs, speeding up processes) while accidentally becoming less effective (losing customers, missing opportunities). The key is measuring outcomes, not just outputs.
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