Read a chart before you read a story into it
A practical clinic for employees who want to interpret charts with care and ask more useful questions. The worked example on this page uses fictional Northstar Services support-request data; its figures are illustrative, not company results.
The values behind the chart
Fictional Northstar Services example. The same 100-employee denominator is used in all four weeks.
| Week | Support requests per 100 employees |
|---|---|
| Week 1 | 40 |
| Week 2 | 50 |
| Week 3 | 45 |
| Week 4 | 60 |
Use this four-part reading routine
Worked example: fictional weekly support requests per 100 employees at Northstar Services, for four consecutive weeks.
The chart and table use authored sample values for a population of 100 employees in each week; they are not live or measured organizational results.
-
1
Read the axes and units
Check what each axis measures, the unit, the time period, and whether the scale starts at zero. In this example, the horizontal axis is Week 1–4 and the vertical axis is requests per 100 employees. -
2
Compare like with like
The sample values are 40, 50, 45, and 60 requests per 100 employees. Week 4 is 20 higher than Week 1 on this scale; confirm the employee denominator and counting method stayed consistent before treating that as a fair comparison. -
3
Look for missing context
Ask whether a reporting change, holiday, staffing change, or unusual event affected the counts. The example provides no explanation for the rise, so the chart alone cannot establish its cause. -
4
Ask what evidence would help
Try: “Were requests counted the same way each week, and what changed in the final week?” Then ask whether a longer time series or a breakdown by request type would help answer the question.
A quick reference for chart discussions
Separate what is visible from what is inferred.
Axis: A scale or category line that identifies what is being measured. Read its label and units before comparing values.
Denominator: The total or population used to put a count in context, such as requests per 100 employees. Check whether it is stated and consistent.
Baseline: The reference value or period used for comparison. Ask what it is and why it is appropriate.
Observation: “The sample chart shows 60 requests per 100 employees in Week 4 and 40 in Week 1.”
Explanation: “The increase happened because demand rose.” That may be a hypothesis, but the chart alone does not establish it.
Useful questions: What is counted? Over what period? Compared with what? Who or what is included? What changed in how the data was collected? What additional evidence could distinguish possible explanations?
Questions that come up in practice
Use these prompts when a chart is unclear or the discussion moves beyond what it shows.
What if the chart has no baseline?
Describe the visible values without claiming that they are high, low, improving, or worsening. Ask the chart owner what comparison would be meaningful—for example, a previous period or a stated target—and why.
What if the axes or units are missing?
Do not guess. Ask what the axis measures, which units are used, and what time period the chart covers before comparing points or repeating a conclusion.
When should I ask the chart owner for clarification?
Ask when the definition, denominator, collection period, scope, or comparison is unclear, or when someone is treating a pattern as proof of a cause. Request the source and the assumptions behind the chart.
Can I explain why a value changed?
Not from a chart alone unless the chart includes evidence that supports the explanation. State the observation separately, label possible causes as hypotheses, and ask what additional evidence would test them.