The decision
Show the context needed to interpret the comparison and use a visual form that fits the data. Ask the data owner to confirm definitions before polishing the chart.
Rehearse this before accepting the change
Ask a reader to describe the chart's main claim and its limits.
Use fictional examples and an authorised test environment. Record what happened, the evidence you inspected and any issue that still needs a responsible owner.
Choose a useful measure
Track charts requiring verbal correction during review.
Agree the definition and baseline with the team doing the work. Review the result over a comparable period and note other changes that could affect it.
Your planning worksheet
Use these checks to prepare a discussion with your team or supplier. Tick a check when you have recorded the decision or evidence, rather than when a feature has simply been promised.
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Further reading
These primary sources provide additional context for the project decisions above.
Related decisions
Turn the brief into a working service
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