Reading charts and tables
Examine axes, categories and missing context before interpreting a visual.
What you will learn
- Check scales, units and time periods.
- Identify omitted categories and aggregation effects.
- Match a chart to the decision being made.
Charts direct attention, but design choices can magnify or conceal differences. Begin with the axis range, unit, time period, group definitions and source before interpreting the shape.
Core method
Charts direct attention, but design choices can magnify or conceal differences. Begin with the axis range, unit, time period, group definitions and source before interpreting the shape.
- Define the exact decision or claim before analysing detail.
- Use evidence that is relevant to the stated context.
- Record uncertainty instead of replacing it with confident wording.
Applied case
A bar chart beginning at 94 shows satisfaction scores of 96 and 98 as dramatically different. The two-point difference may matter, but the truncated axis exaggerates its visual size.
Apply the method
List the checks needed before recommending action from the chart.
Review answer guidance
Check the full scale, sample size, response rate, question wording, uncertainty, subgroup composition and whether a two-point difference is operationally meaningful.
Use in an assessment
Apply the method to the information provided in the task. A strong response makes its reasoning traceable and does not rely on specialist facts that are absent from the evidence.
- Read the requested outcome and constraints first.
- Eliminate responses that exceed the available evidence.
- Review whether the conclusion answers the precise question.