One chart shows household appliance ownership rising. Another shows weekly housework hours falling. It is tempting to write:
Greater appliance ownership caused the decline in housework.
The visuals move in opposite directions, but that does not demonstrate cause. A precise Task 1 sentence reports the relationship actually visible:
Appliance ownership increased as weekly housework hours declined over the period.
Mixed-chart tasks test more than trend vocabulary. You must reconcile separate measures, choose a shared story, and keep claims within the evidence. IELTS Academic Writing Task 1 asks you to summarize one or more visual items, report the main features, and make relevant comparisons. You write at least 150 words, normally in about 20 minutes, and all required information is supplied in the task.
Use the IELTS vocabulary practice hub for the wider exam pathway or browse the Exam English hub.
Build a two-visual map
Before writing, make a compact inventory:
| Visual | Unit | Main feature | Useful link |
|---|---|---|---|
| bar chart | percentage of households | ownership rises | same years |
| line graph | hours per week | time falls | opposite direction |
Do not combine the figures as if they shared a unit. “Ownership exceeded housework” is meaningless because a percentage cannot exceed a number of hours in a useful comparative sense.
Your overview should usually include one major feature from each visual and, if justified, one cross-visual relationship. Detail paragraphs then support those features with selected numbers.
1. Depict: say what a visual presents
Depict means show or represent visually.
The bar chart depicts ownership rates for three appliances, while the line graph shows weekly housework hours.
It does not mean prove, explain, or cause. A chart may depict two patterns without demonstrating a mechanism between them. In many introductions, the plain verb show is equally accurate. Choose depict because it fits, not because it sounds more advanced.
2. Account for: identify a share or cautiously name an explanation
In statistical description, account for often states a portion:
Online purchases accounted for 46% of total sales.
Its causal sense means explain a result, but a mixed chart rarely licenses that conclusion alone. If the task gives only parallel data, do not write “online access accounted for the sales increase.” Report that both measures changed instead.
This boundary is especially important in mixed visuals: proximity on the page does not turn one measure into an explanation of the other.
3. Constitute: combine parts within one measured whole
Constitute lets parts form a stated total:
The two youngest groups constituted 58% of all visitors.
Use it within a visual whose categories share the same denominator. Do not combine 35% from a pie chart with 20 hours from a line graph and call the result a total. Mixed charts often invite connection, but their numbers remain governed by separate units.
4. Predominant: name the leading category, not just a common one
Predominant identifies the main or largest element in a defined set.
Private cars remained the predominant mode of travel in all three years.
That claim requires a visible ranking in every named year. If cars lead only in the final year, restrict the sentence accordingly. Predominant does not merely mean widespread, and it does not explain why the category leads.
5. Largely: mark “mostly,” leaving a remainder
Largely can summarize composition or a broad pattern:
Growth was largely concentrated in the two urban categories.
The detail must show that most, but not necessarily all, of the growth occurred there. Do not use it for magnitude: “sales increased largely” is not a clear substitute for “sales increased substantially.”
In a cross-visual sentence, be careful with causal frames such as “the fall was largely due to.” Unless the task itself supplies causal evidence, due to goes beyond description.
Understanding is only the first step.
Lyra Practice helps you retrieve and use high-value workplace expressions in realistic situations until they feel natural.
Start a practice session →6. Disproportionate: compare against an explicit baseline
Mixed charts can supply the benchmark needed for disproportionate. Imagine one visual shows regional population shares and another shows grant shares:
Region A received a disproportionately large grant share relative to its share of the population.
The phrase relative to names the baseline. Without that second measure, the adjective becomes an unsupported evaluation. It does not automatically mean unfair, harmful, or intentional.
7. Negligible: decide whether a difference matters in this display
Negligible means too small to matter for the decision or analysis at hand.
The gap between the two rural categories remained marginal throughout.
Support that sentence with values and scale. Marginal reports a very small gap without claiming it is unimportant. Negligible additionally dismisses the gap as immaterial, and most descriptive charts supply no decision criterion for that judgment. A one-unit gap on a 0–10,000 scale may be tiny, but “a difference of one unit” remains the safest literal report.
Three safe cross-visual relationships
Same direction
Both participation and funding rose between 2015 and 2025.
This reports parallel movement. It does not state that funding produced participation.
Opposite direction
The proportion of car journeys fell as rail use increased.
As here marks concurrent change. If causal ambiguity worries you, write “Over the same period” and use two clauses.
Mismatch between shares
The region accounted for 40% of output but only 18% of employment.
This is a direct, useful comparison because both shares have clear denominators. It may support “a disproportionately large output share relative to employment,” but it still does not explain the mismatch.
Worked mixed-chart plan
Imagine a bar chart with library visits in 2010 and 2020 and a pie chart showing the 2020 budget. Visits rise at branches A and B but fall slightly at C. In 2020, A receives 50% of funding, B 35%, and C 15%.
Introduction
The bar chart depicts visits to three library branches in 2010 and 2020, while the pie chart shows how the 2020 budget was distributed among them.
Overview
Overall, visits increased at branches A and B, whereas C recorded a slight decline. A was the predominant branch in both 2020 visits and funding, while C had the smallest share of each measure.
Details
Visits to A rose from 60,000 to 90,000, and the branch accounted for half of the 2020 budget. B also grew, from 40,000 to 70,000 visits, while receiving 35% of funding. By contrast, C’s attendance slipped from 25,000 to 22,000, and its budget share stood at 15%.
The response connects the visuals through ranking and shared categories. It does not claim that A’s funding caused its attendance or that C was underfunded.
Organize by story, not by picture frame
Two structures can work:
- Visual by visual: describe the first visual, then the second, while maintaining links.
- Feature by feature: group the leaders together, then the smaller or contrasting categories.
Choose the structure that makes comparisons clear. A mixed task does not require one paragraph per picture. It does require readers to know which unit and period each figure belongs to.
Use unit nouns repeatedly where ambiguity is possible: percentage, number of visits, hours, tonnes, dollars, share, rate. Pronouns such as this figure help only when their reference is unmistakable.
Controlled practice
1. Remove false cause
As ticket prices fell, attendance rose, proving that cheaper tickets caused the increase.
Answer: Ticket prices fell over the period, while attendance rose. The charts show concurrent change but do not establish that one caused the other.
2. Keep units apart
Solar power, at 28%, was higher than electricity use, at 16 gigawatt-hours.
Answer: Solar power accounted for 28% of capacity, while electricity use stood at 16 gigawatt-hours. Do not rank unlike measures without a meaningful shared basis.
3. Earn “disproportionate”
Chart A: district X contains 12% of residents. Chart B: it receives 31% of capital spending.
Answer: District X received a disproportionately large share of capital spending relative to its population share. This describes a mismatch, not its cause or fairness.
4. Select an overview
Visual 1: all three product sales rise, led by A. Visual 2: A has 55% of advertising, B 30%, C 15%.
Answer: Overall, sales increased for all three products, with A remaining predominant. A also accounted for more than half of advertising expenditure. Stop there; “advertising drove its sales” is not shown.
Common mixed-chart failures
- Two disconnected mini-reports: include at least one defensible shared feature.
- Every number included: select evidence for the overview.
- Units disappear: label figures so readers can follow the comparison.
- Correlation becomes cause: use while, whereas, over the same period, or coincided with cautiously.
- A value judgment enters: disproportionate needs a benchmark; inefficient or unfair usually needs evidence the charts do not provide.
- Trend language enters a static visual: a single-year pie chart has shares, not rises or falls.
Final review
Check that each visual appears in the overview, each comparison uses compatible measures, and every cross-visual claim remains descriptive. Confirm that depict introduces what is shown, account for or constitute reports composition, predominant rests on rank, and evaluative terms have explicit evidence.
If you want to practise connecting multiple visuals without overstating the evidence, try Lyra Practice.
Sources
- IELTS Academic Writing test format
- IELTS Writing test preparation resources
- IELTS Academic Writing sample tasks
Related
- IELTS Vocabulary for Change and Trends
- IELTS Task 1 Bar and Pie Chart Vocabulary
- IELTS Task 1 Table Vocabulary
- PTE Describe Image Vocabulary for Maps and Processes
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