The most convincing evidence in your impact story could be a quote from the right person (especially useful when quantifiable impact metrics aren’t yet available).
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When we edit impact stories, there are those that hedge and those that escalate. Useful, credible impact stories sit in the Goldilocks zone in between.
The 5 Ws (who, what, when, where, why) are the foundation of news writing because they force you to answer: Why should I care? Impact stories are better when they apply this discipline.