HOW SINGAPORE EDUCATION WORKS · Writing figure captions for adult study and work
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A useful figure caption tells readers what they are seeing, who or what the data represent, the units, the meaning of symbols and any essential conditions. Number the figure so the report can refer to it. Explain the display before making a claim about its significance.
Full chapter index · Practice and checking · Sources and next reading · How Singapore Education Works
This routine is useful when returning to formal study, preparing a workplace learning report or sharing results from a community project in later life. The worked example uses fictional data and an original plot. It demonstrates clear explanation, not compliance with every university, employer or journal style.
The choices at a glance
| What you notice | Possible issue | Useful next move |
|---|---|---|
| Readers cannot identify the dots | The observation unit is missing | Say what one point represents |
| Caption still names an old sample | Figure and explanation changed separately | Check labels and counts together |
| A mean difference becomes a causal claim | Interpretation exceeds the design | Describe the observed values and their limits |
Full chapter index
Understand the reader's questions
Match a caption to a plot
Repair and practise
Recall and transfer
CHAPTER 1 OF 8 · Understand the reader's questions
1. Begin with the reader's questions
Imagine someone sees your figure without the paragraph that introduces it. Can they identify the task, the groups, the measured quantity and the scale? Can they tell whether a dot represents one person, an average or something else?
A title such as “Results” answers almost none of these questions. A caption can provide the missing context without turning into a second methods section.
Read the actual brief before formatting. Numbering, title placement, source notes and typography vary. Do not assume that a good explanatory caption automatically follows APA, IEEE or another named style.
For this teaching example, the caption sits below the plot. If your required style places a figure number and title above it, use that structure while preserving the information readers need.
CHAPTER 2 OF 8 · Understand the reader's questions
2. Define what each visual element means
Identify the measured quantity and its unit. “Time” is incomplete if the reader cannot tell whether the scale shows seconds, minutes or hours.
Define groups without assuming readers remember a code from an earlier paragraph. Define dots, lines, colours and error bars when they appear. Do not call a line an average merely because it looks like one; check how the figure was made.
State the sample size in a way that identifies the unit. Three people completing one attempt each differs from one person completing three attempts. The same number of plotted observations can arise from different designs.
A source note is a separate responsibility. If you reuse or adapt a figure, follow the relevant attribution and permission requirements. A redrawn figure based on someone else's data is not automatically original data.
CHAPTER 3 OF 8 · Match a caption to a plot
3. Worked case: six volunteers and two instruction cards
Our fictional task involves six volunteers. Three use instruction card A and three use card B. Each person completes one practice sorting task once. The measured quantity is completion time in minutes. No random assignment or matching of participants is specified.
| Instruction card | Individual completion times, minutes | Mean, minutes |
|---|---|---|
| A | 2, 4, 6 | 4 |
| B | 4, 6, 8 | 6 |
The original plot displays each volunteer as a dot and each group mean as a short horizontal line. It contains no error bars. The dots show the recorded individual values; they are not confidence limits.
Checking answer: card A's total is 12 minutes across three volunteers, so its mean is four. Card B's total is 18, so its mean is six. The difference between these group means is two minutes.
The figure can show that difference in these fictional observations. It does not establish that card A caused faster performance: the people in the two groups may differ in relevant ways.
CHAPTER 4 OF 8 · Match a caption to a plot
4. Build a caption that matches the figure
Start with what was measured: completion time for a practice sorting task. Identify A and B as instruction cards, define the visual marks and state that three different volunteers contributed to each group.
A complete practice caption is: “Figure 1. Completion time for a practice sorting task using instruction cards A and B. Each dot represents one volunteer's single attempt, measured in minutes; short horizontal lines show group means. There are three volunteers per card. All data are fictional.”
Check every clause against the actual plot and the case description. The caption says “single attempt” because that is the stated design. It does not invent random assignment, demographic details or an independent replication.
Avoid a caption such as “The improved card makes everyone faster.” It fails to identify which card is meant, claims cause without a supporting design and says “everyone” despite showing only six volunteers.
Your main text can discuss the observed difference and its limits. The caption's first job is to make the figure intelligible.
If readers ask what a dot means, define the observation unit. If they ask what the short lines mean, name the calculation. If they mistake minutes for seconds, put the unit where it can be found in both the axis label and the explanation.
If the caption says “average participant” when the line shows a group mean, change the wording. A mean is a summary of values, not necessarily the performance of a particular person.
If the figure was updated but the caption still describes an old sample, check both together. A changed dataset can alter the number of points, group labels and calculation.
If you cannot explain an error bar, return to the calculation or ask the person who produced the plot. Do not label it “variation” or “confidence” by guesswork. This example deliberately uses individual points and means without error bars.
CHAPTER 6 OF 8 · Repair and practise
6. Guided caption checking and independent practice
For guided practice, inspect this sentence: “Each dot is a participant's average across three attempts.” Compare it with the original case. What needs to change?
Checking answer: each volunteer completed one attempt, so each dot represents that single completion time. Three volunteers contributed to each card group; three is not the number of attempts per person.
For independent practice, consider a new fictional dataset. Card C has times of three, six and nine minutes; card D has times of five, five and eight minutes. Each value again comes from a different volunteer completing one attempt. Calculate both means, then assess the proposed title “Identical performances.”
Checking answer: both totals are 18, so both means are six minutes. The individual values differ. Equal means do not make the performances identical. A caption should define the marks and groups; the text can explain the equal means alongside the different values.
Now write your own caption for that proposed plot. Include the task, unit, meaning of each point and mean line, three volunteers per group and the fictional status of the data. Do not copy A and B into a caption for C and D.
CHAPTER 7 OF 8 · Recall and transfer
7. Recall later and transfer to a community report
The next day, cover the worked caption and reconstruct the information it supplies. Then inspect the figure itself. Which details can be read directly from the plot, and which require the surrounding study description?
Transfer to a community-class report showing counts of preferred workshop topics. The measured quantity is now a count of responses, not completion time. If people could select several topics, the bars need not sum to the number of respondents.
A returning learner in Singapore may encounter these tasks in formal courses or at work. Our guide to adults returning to university addresses that broader route; the caption routine is an optional study technique, not an admissions condition.
The SMU Centre for Excellence in Teaching and Learning resource on tables and figures provides a Singapore academic-communication connection. Its guidance should be read in context rather than treated as every institution's universal style.
Monash University's journal-article writing guide highlights differences in figure formatting across styles. That global connection explains why content accuracy and format compliance need separate checks.
Must the caption repeat every value?
Usually the figure should display values clearly enough that the caption can explain their meaning. Include key details needed to interpret the display. Follow the brief if it asks for a specific form of reporting.
Is a caption the same as alternative text?
No. A caption is visible explanatory text associated with a figure. Alternative text provides an accessible text alternative for an image. Coordinate them so a reader can understand the figure without relying on colour or visual inspection alone.
Can I leave out the sample size?
Sometimes it belongs elsewhere under the required format, but the reader still needs to know what observations support the figure. In this exercise, three volunteers per group is essential context.
Should I describe a trend as significant?
Use that term only when its meaning is clear and the relevant analysis supports it. A visibly different mean is not, by itself, a statistical test. Our worked figure makes no claim of statistical significance.
Sources and next reading
Reviewed 23 October 2026. The plot, volunteers, values, calculations and captions are original fictional teaching material.
SMU: Tables and Figures supplies the Singapore academic-writing connection. Monash University: Structuring the article supplies the international comparison of formatting conventions.
Continue through the How Singapore Education Works hub for adult learning, school and university guides.
Learning at other stages
Continue with a different learning task in this series. Each guide has its own worked cases, practice and limits.
Comparing container capacity in kindergarten