When a line chart has several points, first compare the direction of each line and then select numbers that show the biggest difference. A good comparison tells the reader what changed, not just what each number was.

Make the overall comparison first

Imagine a practice chart for two library branches. Branch A goes from 100 to 150 to 200 monthly visits over three selected months, while Branch B goes from 180 to 160 to 140. An overview might say: “Visits rose at Branch A but fell at Branch B, leaving Branch A ahead by the final month.”

Select numbers that support the overview

Use the first and final figures to show how the gap reversed. You do not need to narrate every midpoint in a short exercise. Check the unit: these are visits, not necessarily unique visitors. Do not suggest that opening hours caused the change unless the source supplies that information.

Frequently asked question

Should the overview include figures?

For this drill, start with the pattern in words and put figures in the supporting paragraph. That makes it easier to see whether the overview is doing its job.

For a follow-up routine, read our weekly IELTS error-log guide.

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