Most data carries uncertainty. Communicating it clearly helps decision-makers avoid overconfidence without drowning in caveats.
Use Ranges
"Sales will grow 5–9%" is more honest than "7%". Show likely ranges on charts with bands or error bars.
Use Natural Frequencies
"About 3 in 10 projects like this overrun" is easier to understand than "30% probability".
Scenarios
Present best, expected and worst cases with the assumptions behind each.
Say What Would Change Your Mind
Explain which new information would alter the conclusion.
Separate Evidence From Judgement
Distinguish what the data shows from your interpretation.
Avoid False Precision
Round numbers sensibly; "12.37%" implies certainty the data doesn't support.
Focus on Decisions
Explain whether the uncertainty affects the choice. Sometimes every plausible outcome favours the same decision.
Consistent Language
If you use words like "likely", define what they mean in probability terms.