effective

B1Frequent NGSL-2
UK /ɪˈfektɪv/US /ɪˈfektɪv/

Meaning

adjective
producing the result that is wanted or intended; producing a successful result
Aspirin is a simple but highly effective treatment.

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there was no assurance that it would be effective if we scaled.

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far more effective selling tool than

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be the most effective at improving learning outcomes for their students?

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there was no assurance that it would be effective if we scaled.

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