WHY ENGLISH?
Translate a visual display into a precise evidence story that helps readers see the relationship without overstating what the data proves
Writing about data, graphs and charts means choosing which relationships matter, naming them precisely and preserving the display’s units, baseline, variation and uncertainty. English matters because words such as increased, doubled, stable, significant and caused can change the claim even when the numbers stay the same.
The National University of Singapore Centre for English Language Communication currently lists a scientific-writing resource specifically about data, graphs and charts. Its current academic-writing guidance also emphasises reporting methods, data analysis and findings and evaluating them in context, while reminding students that conventions vary by discipline.
This article uses a fictional chart comparing weekly reading time and comprehension scores across four study groups. It does not teach statistics, validate a dataset or make a graph trustworthy by description alone. Writers must inspect the source, method and chart construction before drawing conclusions.
Article contents
Open all chapters
- 1. Identify the Display and Its Purpose
- 2. Read the Source, Population and Method
- 3. Decode Axes, Units, Scale and Baseline
- 4. Choose the Main Relationship
- 5. Describe Levels and Differences Precisely
- 6. Describe Change and Trend With a Baseline
- 7. Compare Groups Without Erasing Variation
- 8. Use Association and Causation Language Carefully
- 9. Report Uncertainty, Missingness and Chart Limits
- 10. Write a Bounded Interpretation
- 11. Check the Sentence Against the Display
ORIENTATION
What this guide covers
Current fact check
Checked on 9 November 2026, the current NUS CELC resources page listed a scientific-writing guide to writing about data, graphs and charts, alongside lab-report and methods resources. The current CELC academic-writing page said laboratory reports and longer projects may require reporting data analysis and findings and critically evaluating them. This article therefore treats language as part of evidence interpretation, not as a substitute for statistical or source checks.
What this guide does not cover
This article owns the task of describing and interpreting a table, graph or chart in school, study or work. It does not own statistical analysis, chart design, data cleaning, causal inference, source verification, dashboard governance, a full research report or subject-specific marking criteria.
Worked example
Every chapter returns to a fictional chart comparing weekly reading time and comprehension scores across four study groups, with unequal group sizes and visible within-group variation. It is fictional, low-stakes and educational; it does not report a real school, clinical decision or guaranteed outcome.
Did You Know? For a data graphs charts, precise writing makes appraisal possible but does not perform the appraisal, remove bias or guarantee transfer.
Warm up with eduKate’s guides to explaining scientific evidence and asking better questions in class.
CHAPTER 1 OF 11
1. Identify the Display and Its Purpose
Why this move matters
Name whether the object is a table, bar chart, line graph, scatterplot or other display and what question it helps answer.
Did You Know? Naming the display prevents accidental assumptions about continuity or relationship.
Begin with what the display actually contains
Name whether the object is a table, bar chart, line graph, scatterplot or other display and what question it helps answer. In The chart compares reading time and comprehension across four groups., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Different display types support different reading tasks.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The chart compares reading time and comprehension across four groups.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Different display types support different reading tasks. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Name whether the object is a table, bar chart, line graph, scatterplot or other display and what question it helps answer.
- Boundary: Different display types support different reading tasks.
- Application: The chart compares reading time and comprehension across four groups. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Identify the Display and Its Purpose” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 2 OF 11
2. Read the Source, Population and Method
Why this move matters
Check who or what was measured, when, where, how, sample size, missing data and source authority.
Did You Know? Context is part of the evidence.
Begin with what the display actually contains
Check who or what was measured, when, where, how, sample size, missing data and source authority. In The groups contain different numbers of students and were measured over six weeks., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: A polished chart can still come from weak or incomplete data.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The groups contain different numbers of students and were measured over six weeks.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. A polished chart can still come from weak or incomplete data. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Check who or what was measured, when, where, how, sample size, missing data and source authority.
- Boundary: A polished chart can still come from weak or incomplete data.
- Application: The groups contain different numbers of students and were measured over six weeks. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Read the Source, Population and Method” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 3 OF 11
3. Decode Axes, Units, Scale and Baseline
Why this move matters
Verify labels, categories, intervals, zero points, transformations and whether axes are truncated or logarithmic.
Did You Know? A unit can change an adjective from accurate to misleading.
Begin with what the display actually contains
Verify labels, categories, intervals, zero points, transformations and whether axes are truncated or logarithmic. In Reading time is hours per week; comprehension is a percentage on a stated assessment., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Never compare slopes or areas before understanding scale.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from Reading time is hours per week; comprehension is a percentage on a stated assessment.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Never compare slopes or areas before understanding scale. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Verify labels, categories, intervals, zero points, transformations and whether axes are truncated or logarithmic.
- Boundary: Never compare slopes or areas before understanding scale.
- Application: Reading time is hours per week; comprehension is a percentage on a stated assessment. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Decode Axes, Units, Scale and Baseline” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 4 OF 11
4. Choose the Main Relationship
Why this move matters
Decide whether the reader needs level, change, ranking, distribution, composition or association.
Did You Know? Selection should follow the question, not the most dramatic shape.
Begin with what the display actually contains
Decide whether the reader needs level, change, ranking, distribution, composition or association. In The main comparison is between group reading time and average comprehension, not the colour of each group., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Do not describe every visible number with equal weight.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The main comparison is between group reading time and average comprehension, not the colour of each group.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Do not describe every visible number with equal weight. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Decide whether the reader needs level, change, ranking, distribution, composition or association.
- Boundary: Do not describe every visible number with equal weight.
- Application: The main comparison is between group reading time and average comprehension, not the colour of each group. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Choose the Main Relationship” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 5 OF 11
5. Describe Levels and Differences Precisely
Why this move matters
Use values, ranges, percentage-point differences or ratios appropriate to the measure.
Did You Know? Precise comparison language protects magnitude.
Begin with what the display actually contains
Use values, ranges, percentage-point differences or ratios appropriate to the measure. In Group B scored eight percentage points above Group A, not eight percent higher., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Percent and percentage points are not interchangeable.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from Group B scored eight percentage points above Group A, not eight percent higher.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Percent and percentage points are not interchangeable. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Use values, ranges, percentage-point differences or ratios appropriate to the measure.
- Boundary: Percent and percentage points are not interchangeable.
- Application: Group B scored eight percentage points above Group A, not eight percent higher. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Describe Levels and Differences Precisely” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 6 OF 11
6. Describe Change and Trend With a Baseline
Why this move matters
Name start, end, interval, direction and magnitude; distinguish fluctuation from sustained trend.
Did You Know? Trend language contains a time claim.
Begin with what the display actually contains
Name start, end, interval, direction and magnitude; distinguish fluctuation from sustained trend. In A later line chart rises for three weeks, dips once and ends above its starting value., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: One increase between two points is not automatically a long-term trend.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from A later line chart rises for three weeks, dips once and ends above its starting value.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. One increase between two points is not automatically a long-term trend. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Name start, end, interval, direction and magnitude; distinguish fluctuation from sustained trend.
- Boundary: One increase between two points is not automatically a long-term trend.
- Application: A later line chart rises for three weeks, dips once and ends above its starting value. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Describe Change and Trend With a Baseline” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 7 OF 11
7. Compare Groups Without Erasing Variation
Why this move matters
Report central values alongside spread, overlap, unequal samples or outliers where relevant.
Did You Know? Variation can change the practical meaning of a difference.
Begin with what the display actually contains
Report central values alongside spread, overlap, unequal samples or outliers where relevant. In Two groups have similar averages but very different score ranges., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: An average student may not exist in the dataset.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from Two groups have similar averages but very different score ranges.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. An average student may not exist in the dataset. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Report central values alongside spread, overlap, unequal samples or outliers where relevant.
- Boundary: An average student may not exist in the dataset.
- Application: Two groups have similar averages but very different score ranges. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Compare Groups Without Erasing Variation” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 8 OF 11
8. Use Association and Causation Language Carefully
Why this move matters
Describe correlation or co-movement without claiming one variable produced the other unless design supports it.
Did You Know? A cautious verb can be more informative than a confident false cause.
Begin with what the display actually contains
Describe correlation or co-movement without claiming one variable produced the other unless design supports it. In Higher reading time is associated with higher scores across the four groups., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: The chart alone cannot rule out prior attainment, teaching or selection differences.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from Higher reading time is associated with higher scores across the four groups.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. The chart alone cannot rule out prior attainment, teaching or selection differences. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Describe correlation or co-movement without claiming one variable produced the other unless design supports it.
- Boundary: The chart alone cannot rule out prior attainment, teaching or selection differences.
- Application: Higher reading time is associated with higher scores across the four groups. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Use Association and Causation Language Carefully” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 9 OF 11
9. Report Uncertainty, Missingness and Chart Limits
Why this move matters
Mention confidence intervals, error bars, suppressed values, missing periods or construction choices that affect reading.
Did You Know? Uncertainty belongs in the main story when it can change the conclusion.
Begin with what the display actually contains
Mention confidence intervals, error bars, suppressed values, missing periods or construction choices that affect reading. In The chart shows wide uncertainty for the smallest group., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Absence from a display does not prove a value is zero.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The chart shows wide uncertainty for the smallest group.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Absence from a display does not prove a value is zero. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Mention confidence intervals, error bars, suppressed values, missing periods or construction choices that affect reading.
- Boundary: Absence from a display does not prove a value is zero.
- Application: The chart shows wide uncertainty for the smallest group. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Report Uncertainty, Missingness and Chart Limits” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 10 OF 11
10. Write a Bounded Interpretation
Why this move matters
Connect the pattern to the subject question, theory or decision while naming alternative explanations.
Did You Know? Interpretation adds meaning without outrunning design.
Begin with what the display actually contains
Connect the pattern to the subject question, theory or decision while naming alternative explanations. In The chart supports further study of reading routines but not a universal time target., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: A descriptive display cannot answer every why question.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The chart supports further study of reading routines but not a universal time target.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. A descriptive display cannot answer every why question. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Connect the pattern to the subject question, theory or decision while naming alternative explanations.
- Boundary: A descriptive display cannot answer every why question.
- Application: The chart supports further study of reading routines but not a universal time target. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Write a Bounded Interpretation” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
CHAPTER 11 OF 11
11. Check the Sentence Against the Display
Why this move matters
Point to the exact visual evidence for every numerical claim, verify calculations and test whether another reader would infer the same boundary.
Did You Know? The final audit reconnects language to pixels and numbers.
Begin with what the display actually contains
Point to the exact visual evidence for every numerical claim, verify calculations and test whether another reader would infer the same boundary. In The writer recalculates the ratio and revises “doubled” to “rose by about half”., identify population, measure, units, time, categories, source and chart construction before narrating a trend.
Select the relationship that answers the reader’s question
Prioritise level, change, comparison, distribution or association and state the baseline. Keep this limit: Never round in a way that reverses or exaggerates the relationship.
Use language that matches evidence strength
Describe magnitude, direction, variation and uncertainty from The writer recalculates the ratio and revises “doubled” to “rose by about half”.; reserve causal verbs for designs that justify them.
End with a bounded conclusion
Connect the display to the decision while naming missing context and the next useful check. Never round in a way that reverses or exaggerates the relationship. Clear commentary should make the graph easier to audit, not merely more persuasive.
Practical reader check
- Evidence: Point to the exact visual evidence for every numerical claim, verify calculations and test whether another reader would infer the same boundary.
- Boundary: Never round in a way that reverses or exaggerates the relationship.
- Application: The writer recalculates the ratio and revises “doubled” to “rose by about half”. Name the next output and how it will be checked.
Student, parent and career transfer
Practise “Check the Sentence Against the Display” by separating evidence, interpretation, decision and next action. A parent, teacher or teammate can ask what supports the sentence and which missing fact could change it. This discipline transfers to school science, geography, economics, university study, research, journalism, policy, business analysis and data-informed presentations without guaranteeing grades, selection, publication or employment.
PRACTICE LAB
Build a data graphs charts decision trail
Student route
- Choose one original report inside this guide’s scope.
- Copy its objective and underline actor, action, context, evidence and intended decision.
- Draw the specific reasoning chain used in this article.
- Mark each step reported, inferred, contested or unknown.
- Rewrite the conclusion so it preserves the narrowest important limitation.
Parent or teacher route
Ask the learner to explain translate a visual display into a precise evidence story that helps readers see the relationship without overstating what the data proves twice: once to a classmate and once to a method specialist. Praise a precise correction and a well-stated unknown; both show disciplined attention to evidence.
Early-career route
Create a one-page data graphs charts audit with source link, date checked, scope, method logic, decisive wording, contrary evidence, limit and next action. A colleague should be able to continue without guessing.
Decision rule
If a shorter explanation removes the condition that made the original claim true, it is not clearer yet. Restore the condition.
Continue with eduKate’s guides to reading course and career information and giving useful feedback in group projects.
USEFUL NEXT READING
Connect this narrow owner to its neighbour
Read the research-poster guide for a related but different reader job. Return here when the question is specifically how to translate a visual display into a precise evidence story that helps readers see the relationship without overstating what the data proves. Use each guide for the reader task named in its heading.
For English practice across research, school and career communication, visit the Singapore English Tuition Centre learning site.
FREQUENTLY ASKED QUESTIONS
Questions students and parents often ask
Should I describe every number?
No. Select the values that answer the question and preserve important variation or exceptions.
What is the difference between percent and percentage points?
A rise from 40% to 48% is eight percentage points, or a 20% relative increase.
Can I say one variable caused another?
Only when the study design and analysis justify causal inference; a chart alone rarely does.
What does stable mean?
Define the interval and tolerance; small fluctuations may still be present.
Should I mention outliers?
Mention them when they affect interpretation, and do not remove them without a justified process.
Does accurate prose make a chart reliable?
No. Source, data quality, method and visual construction must also be checked.
PRIMARY SOURCES
Read the primary guidance for this data graphs charts
Facts were checked against current official and primary sources on 9 November 2026. Follow the live source for later corrections, completed updates or companion material.
- NUS CELC scientific writing resources
- NUS CELC academic writing resources
- NUS Writing and Communication Hub
- MOE English Language Syllabus 2020 Secondary
- eduKate research poster guide
- eduKate explaining scientific evidence
A cheerful final note
Precise English makes translate a visual display into a precise evidence story that helps readers see the relationship without overstating what the data proves more generous, not less. People can see how their evidence and values entered the work, where disagreement remains and what a responsible next step looks like.