Start here · the long version
What task 1 overview really asks you to write
The overview names the two or three most important things the visual shows, in general terms and without quoting any figure.
Why no figures, and why that feels wrong
The instinct is to prove the summary with a number, and it is exactly the wrong instinct. The overview exists to show that you can look at a visual and say what it means — that you can see the shape of the data rather than only the values in it. A figure in the overview pulls the sentence down into detail, which is Body 1’s job, and it usually crowds out the second big feature you were about to name.
The practical consequence is that the overview needs its own vocabulary, and it is vocabulary of comparison and shape rather than of quantity: which one dominates, what stayed still, what moved together, what moved in opposite directions. If you find yourself unable to write the sentence without a number, that is usually a sign that you have not yet decided what the visual is about.
Shape, not values“Rose throughout”, “moved in opposite directions”, “remained stable”. None of these needs a figure to be true.
Two or three featuresOne is not an overview; five is Body 1. Two clear ones beat four vague ones.
Signal it explicitly“Overall” or “In general” at the start. Examiners look for the overview, and a signposted one is easier to find.
No prediction, no causeThe visual stops where it stops. Why something happened is never on it.
What counts as a “biggest feature”
Three things almost always qualify, and one of them is in nearly every visual. The first is dominance: which category is largest, or which line sits above the others throughout. The second is direction: what the overall movement was, if the visual has a time axis. The third is contrast: two things that behaved differently, which is the feature examiners find most convincing because it cannot be read off a single point.
What does not qualify is anything you would need to squint at. If a feature requires you to compare two nearly identical bars, it belongs in the body paragraphs where you can quote the figures that make the difference visible.
What it costs you to skip this
A missing overview is the most expensive single omission in Task 1, because it is assessed directly and no amount of accurate detail replaces it. A weak one — a single feature, or one buried in figures — costs less but costs consistently, since it is the paragraph an examiner reads to decide whether you understood the visual at all.
Where it stops applying
The overview does not explain and it does not predict. A map of a village that gained a supermarket does not tell you the village grew richer; a graph that ends in 2020 says nothing about 2025. And it does not judge: “a worrying rise” is a claim about the world, not about the chart.