The idea
A numerical message should make its quantity, comparison, and context easy to understand. Readers need to know what the number counts and why it matters. Precision without explanation can create an appearance of clarity while leaving the practical question unanswered.
Worked example
A fictional workshop notice says attendance increased by 50%. The writer adds that participation rose from 20 to 30 people across comparable sessions. Readers can now see both the relative change and its scale. If the room holds only 28 people, the capacity consequence becomes obvious. The editor avoids implying that a larger percentage alone proves better learning, because attendance and educational benefit are different outcomes.
Use it carefully
Numbers can remain uncertain even when presented clearly. State whether quantities are measured, estimated, projected, or illustrative. Use consistent units and avoid unnecessary decimal places. A chart or example should communicate the same quantity as the text. The CDC guide supports clear communication principles; this workshop scenario is an original nonmedical application, not a claim about a particular public program.
FROM UNDERSTANDING TO ACTION
Put it to work.
Rewrite one percentage claim with its starting count, ending count, time period, and practical implication. Identify what the number does not establish.
RETRIEVE. REASON. REMEMBER.
Knowledge check.
Choose one answer for each question, then check your reasoning.
Sources & further reading.
Links support the core concepts or identify the book. Examples, exercises, and critical analysis are original Institute material. Source checks are not an independent expert review of every claim.
- CDC Clear Communication Index: explaining numbers and context ↗
CDC Clear Communication Index: explaining numbers and context; supports the core concept. Scenarios, calculations, and practice questions are original. Source reviewed 2026-10-19.