How Do You Turn HSC Investigation Results into a Scientific Poster?

You turn HSC investigation results into a scientific poster by making three decisions: choose one question your evidence can answer, select one main visual that reveals the important pattern, and write a conclusion that does not claim more than your results support.

The poster should work for someone who has never seen your investigation. They should be able to understand what you tested, what you found, and why it matters without reading a miniature version of your entire laboratory report.

Imagine someone gives your poster 60 seconds of attention. What do you want them to notice first? If the answer is buried in paragraph six, the poster needs restructuring.

01Start with a question, not a topic

A scientific poster needs a central question. Without one, students often end up presenting everything they know about a subject rather than communicating what their investigation actually discovered.

Consider the difference:

The focused questions identify something that can be investigated and measured.

A useful question usually contains four elements:

1. Independent variable: What did you deliberately change?
2. Dependent variable: What did you measure?
3. System: What object, reaction or process did you investigate?
4. Conditions: What important factors did you keep constant?

For example:

How does the final concentration of sodium thiosulfate affect the time taken for a reaction mixture to obscure a marked cross at 20.0°C?

Here:

• Independent variable: sodium thiosulfate concentration.
• Dependent variable: time taken for the cross to disappear.
• System: reaction between sodium thiosulfate and hydrochloric acid.
• Controlled conditions: temperature, hydrochloric acid concentration, total reaction volume and observation method.

Notice that the question describes what was actually measured. The student measured time, not reaction rate directly.

That distinction becomes important when interpreting the results.

A quick decision tree for choosing your question

Use this sequence before designing the poster.

If your investigation does not produce a clear answer, don’t disguise that problem with a more confident title. Narrow the question or explain what your evidence can genuinely establish.

If your poster communicates a depth study, remember that the poster is the presentation of the investigation, not the investigation itself. Your scientific question, method, analysis and evaluation still matter.

For a broader explanation, see What Is a Depth Study in HSC Science? and What Is Working Scientifically in HSC Physics and Chemistry?.

02Decide who will read your poster

Before choosing colours, fonts or layouts, decide who the poster is for.

A useful default audience is another HSC science student who understands the basic course content but knows nothing about your particular investigation.

That reader doesn’t need a complete explanation of chemical reactions, Newton’s laws or electrical circuits. They do need enough context to understand your research question and interpret your results.

Your audience affects three things.

How much background information you include

A poster for fellow HSC students can use appropriate scientific terminology. A poster for a younger audience needs more explanation of unfamiliar concepts.

How much detail your method requires

Your reader needs to understand how the investigation was conducted, particularly which variables were controlled and how measurements were obtained. They don’t need every minor procedural instruction.

What your main visual needs to communicate

A reader familiar with graphs may understand a scatter plot immediately. A general audience might need a short caption explaining what the axes represent and what the pattern means.

A useful test is to ask someone who hasn’t read your report to look at your poster for one minute.

Can they identify:

• What question you investigated?
• What you changed and measured?
• What your main result was?
• What conclusion you reached?

If not, improve the information hierarchy before adding more content.

03Choose one main visual that answers your question

Your main visual should do most of the scientific explaining.

Students sometimes include several graphs because they want to demonstrate how much data they collected. That’s understandable, but more graphs don’t automatically make a stronger poster.

The best visual depends on the type of investigation.

What makes a good scientific graph?

If your main visual is a graph, check the following:

• Put the independent variable on the horizontal axis.
• Put the dependent variable on the vertical axis.
• Include units wherever measurements have units.
• Choose an appropriate scale that makes the pattern visible without distorting it.
• Label each data series clearly.
• Include a legend when necessary.
• Show repeated measurements or uncertainty when they are relevant and available.
• Explain error bars if you use them, including whether they represent standard deviation, range or another measure.

Don’t add a trendline simply because the graph looks unfinished without one. A trendline should represent a relationship that your data and scientific model reasonably support.

Similarly, don’t connect every point with a line automatically. Connecting points is appropriate for some continuous measurements, particularly time-dependent data, but may imply unsupported intermediate values in other investigations.

04Write a conclusion that your results actually support

This is where a scientific poster becomes more than a collection of attractive graphs.

Your conclusion needs to answer the original research question using evidence from your investigation.

A useful structure has four parts:

1. Claim: What did your investigation find?
2. Evidence: Which results support that claim?
3. Scientific reasoning: Why does the observed pattern make sense?
4. Limitations: What can you not confidently conclude?

Let’s return to the sodium thiosulfate example.

A weak conclusion might say:

Increasing concentration makes reactions faster.

This is not necessarily wrong, but it is too broad. It doesn’t identify the actual evidence or the conditions under which the conclusion applies.

A stronger version is:

Increasing the final sodium thiosulfate concentration from 0.040 to 0.100 mol L⁻¹ reduced the mean time taken to obscure the marked cross from 48 seconds to 20 seconds. This supports the prediction that increasing concentration increases the observed reaction rate under the tested conditions. However, the endpoint was determined visually, and only four concentrations were investigated.

This conclusion is stronger because it identifies the size and direction of the observed change.

It also avoids claiming that the investigation established a universal relationship.

The tempting mistake: confusing time with reaction rate

Look carefully at the example.

The mean time decreased by approximately 58%.

\[ \frac{48-20}{48}\times100 =58.3\% \]

That is a percentage decrease in reaction time.

It is not a 58.3% increase in reaction rate.

If you use the reciprocal of time, \(1/t\), as an approximate rate indicator, the ratio between the two endpoint measurements is:

\[ \frac{1/20}{1/48} =\frac{48}{20} =2.4 \]

This means the reciprocal-time indicator increased by a factor of 2.4.

However, \(1/t\) is only a proxy for reaction rate in this experiment. It should not be presented as a direct measurement of the instantaneous rate.

This is exactly why the wording of your conclusion matters.

Explain limitations without undermining your investigation

A limitation is not an admission that your experiment was useless.

It identifies something that affects how confidently your results can be interpreted.

For example:

Choose limitations that genuinely apply to your investigation.

Avoid writing that your experiment was affected by human error without explaining what happened. Identify the specific source of uncertainty and, where possible, suggest how you would improve the method.

If your results did not support your original hypothesis, report that honestly. A scientific poster communicates the evidence, not the result you hoped to obtain.

05Give the poster a clear reading hierarchy

Once you know your question, audience, main visual and conclusion, you can organise the page.

Think of the poster as a guided reading path. The reader should know where to look next without having to work it out.

A useful structure is:

You don’t need to give every section equal space.

Your main results visual should usually be the most prominent element after the title. The conclusion should be easy to find, rather than hidden at the bottom of a long discussion.

Make each section earn its space

A few practical decisions make a considerable difference.

Title

Avoid generic titles such as “Depth Study” or “Science Investigation”.

If your teacher permits a finding-based title, use one that communicates the result.

For the example investigation:

Higher sodium thiosulfate concentrations shortened reaction endpoint time.

If your task requires the research question as the title, use that instead.

Background

Give only enough information for the reader to understand why the investigation was conducted.

A short explanation of the relevant scientific principle is usually more useful than several paragraphs of textbook content.

Method

Explain the essential procedure and identify important controls.

A labelled apparatus diagram can be more useful than a long written description if the arrangement is important to understanding the experiment.

Results

Give your main visual enough room to be read comfortably.

Include the relevant units, measurements and captions. Don’t force the reader to guess what a graph represents.

Discussion and conclusion

Explain the scientific meaning of the results, then answer the original question.

Keep the distinction between what you observed and what you infer.

References

Cite the sources you actually used.

If you used secondary data, identify its original source. If you include a diagram, photograph or other material created by someone else, provide appropriate attribution.

A reference list should allow the reader to locate the source. Writing “Google” is not a useful citation.

Keep the design readable

A scientific poster doesn’t need elaborate decoration.

Use a consistent colour scheme, clear contrast and a small number of font styles. Colour should help distinguish information, such as different experimental conditions, rather than simply fill empty space.

Avoid:

• Long blocks of uninterrupted text.
• Tiny captions and graph labels.
• Decorative images unrelated to the investigation.
• Excessive colours and competing headings.
• Three-dimensional graphs that distort comparisons.
• Background patterns that make text difficult to read.

A useful practical test is to view the poster at its intended display size. Step back and check whether the title, main graph and conclusion remain readable.

There is no universal NESA font size or poster layout that replaces your school’s instructions. These are design recommendations, not formal assessment rules.

06Which HSC requirements actually apply?

It’s worth separating the official requirements from your school’s preferences and general poster-design advice.

NESA requirements

NESA establishes the syllabus outcomes, course requirements and rules governing HSC school-based assessment.

However, NESA does not prescribe one universal scientific poster template for all HSC investigations.

According to the NESA 2026 Rules and Procedures:

• Schools prepare assessment programs in line with NESA requirements.
• Schools set individual assessment tasks, due dates and weightings.
• Assessment tasks may include projects, practical activities and written assignments.
• Work submitted for HSC school-based assessment must be your own.

There is also an important recent change to take-home assessments.

As at 10 November 2026, NESA’s updated rules limit most Preliminary and HSC courses to one take-home assessment task, worth no more than 15% of the school-based assessment.

The implementation dates are:

• HSC courses: Term 4, 2026.
• Preliminary courses: Term 1, 2027.

NESA defines a take-home assessment as a task completed outside a classroom, formal examination setting or teacher-approved monitoring conditions.

A poster is not automatically classified as a take-home assessment just because it is a poster. Its classification depends on how the school sets and supervises the task.

You can check the current details in NESA’s take-home assessment FAQs.

School policies and task requirements

Your school determines the actual requirements of your poster assessment.

Check the task notification and marking criteria for:

• Required poster dimensions or page format.
• Maximum word count.
• Mandatory sections.
• Required graphs, diagrams or photographs.
• Referencing requirements.
• Individual or group-work conditions.
• Submission format and deadline.
• Rules about generative AI and other digital tools.

These requirements take priority over general design recommendations.

For example, if your teacher requires a separate hypothesis section, include it even if you would otherwise combine it with the research question.

Similarly, ask before using generative AI to write, edit or produce visual material for an assessment. NESA’s current assessment rules require school assessment to reflect your own knowledge, skills and understanding. Your school determines the permitted use of tools within its assessment arrangements.

Institution and provider requirements

If you study an HSC course through an institution outside your home school, follow the assessment instructions issued by that institution.

NESA’s assessment guidance recognises that the institution delivering the course may provide the assessment mark.

The relevant provider’s task notification and policies therefore matter alongside the applicable NESA requirements.

UAC requirements

UAC does not set the format, content or marking criteria for your HSC science poster.

University admissions processes are separate from school-based assessment. You do not need to design your poster around UAC preferences or university application requirements.

Check the correct syllabus edition

There is one further detail worth checking if you’re studying Physics or Chemistry.

The 2025 syllabuses have different implementation dates:

• The new Physics 11-12 Syllabus (2025) begins implementation for Year 11 in 2027.
• The new Chemistry 11-12 Syllabus (2025) begins implementation for Year 11 in 2028.

Students already progressing through these courses continue under the applicable transition arrangements.

Always check the syllabus version relevant to your cohort rather than assuming Physics and Chemistry change at the same time.

07Before you submit: a practical poster checklist

Use this checklist to review your final poster.

Scientific content

• [ ] The research question identifies what was investigated.
• [ ] The variables are clearly identified.
• [ ] The method includes the conditions needed to understand the results.
• [ ] The main graph or diagram directly relates to the research question.
• [ ] All axes, units and captions are clear.
• [ ] The conclusion refers to actual results.
• [ ] Limitations are specific and relevant.
• [ ] Sources and borrowed material are appropriately acknowledged.

Communication and design

• [ ] The intended audience is clear.
• [ ] The title communicates the investigation or its main finding.
• [ ] The main visual is immediately noticeable.
• [ ] The reader can follow the poster in a logical order.
• [ ] Text is concise and readable at the intended display size.
• [ ] Colours and headings create a consistent hierarchy.
• [ ] Unnecessary information has been removed.

Assessment requirements

• [ ] The poster follows the teacher’s task notification.
• [ ] All required sections are included.
• [ ] The correct submission format and deadline have been checked.
• [ ] Collaboration, referencing and AI-use requirements have been followed.

08Questions and solutions

Question 1

A student investigates how three brands of paper towel differ in their ability to absorb water.

They use the same starting mass of paper towel, the same water volume and the same soaking time. Each brand is tested five times.

Their proposed poster title is “Paper Towels”.

Write a more appropriate research question and identify the independent and dependent variables.

Solution 1

A suitable research question is:

How does paper towel brand affect the mass of water absorbed under identical testing conditions?

The independent variable is the paper towel brand because this is the factor deliberately changed.

The dependent variable is the mass of water absorbed, measured in grams.

The starting mass of the paper towel, water volume and soaking time are controlled variables.

The original title is too broad because it doesn’t tell the reader what property was investigated. The improved question identifies the comparison and the measurement.

Question 2

A student investigates the effect of insulation material on the cooling of hot water.

They place equal volumes of water at the same initial temperature into three identical containers. One is wrapped in felt, one in aluminium foil, and one is left unwrapped.

Water temperature is recorded every two minutes for 20 minutes.

The poster has space for one main graph.

Which graph should the student use, and why would a column graph showing only the final temperatures be less informative?

Solution 2

A line graph of temperature against time is the most appropriate choice.

Time is the independent variable on the horizontal axis, and water temperature is the dependent variable on the vertical axis.

Each insulation condition should have its own data series.

The line graph shows how quickly each container loses heat throughout the investigation. It also reveals whether the cooling patterns change over time.

A column graph of final temperatures would show which container retained the most heat at the end, but it would hide the shape of the cooling process.

For example, two containers might finish at similar temperatures despite having cooled at very different rates during the first ten minutes.

The correct visual depends on the research question. Because this investigation examines cooling over time, the complete temperature-time relationship is more informative than one final measurement.

Question 3

A student investigates how sodium thiosulfate concentration affects reaction time.

Their results show:

• At 0.040 mol L⁻¹, the mean endpoint time is 48 seconds.
• At 0.100 mol L⁻¹, the mean endpoint time is 20 seconds.

The student writes:

“Increasing sodium thiosulfate concentration increased reaction rate by 58%.”

Is this conclusion scientifically accurate? Rewrite it to reflect the measurements.

Solution 3

No. The 58% figure represents the decrease in endpoint time, not the percentage increase in reaction rate.

The percentage decrease in time is:

\[ \frac{48-20}{48}\times100 =58.3\% \]

The student has correctly identified the approximate percentage change in time but has described it incorrectly as a change in rate.

A more accurate conclusion is:

“Increasing sodium thiosulfate concentration from 0.040 to 0.100 mol L⁻¹ reduced the mean time taken to obscure the marked cross from 48 seconds to 20 seconds, a decrease of approximately 58%. This supports a faster observed reaction at higher concentrations under the conditions tested.”

The conclusion is careful because the investigation measured endpoint time rather than directly measuring reaction rate.

If the student also uses \(1/t\) as an approximate rate indicator, that should be clearly identified as a proxy rather than a direct rate measurement.

Question 4

A student prepares a poster for an audience of HSC science students who have not seen the investigation.

Their first draft contains:

• 700 words of background and method.
• Five photographs of laboratory equipment.
• A table containing 48 individual measurements.
• Three graphs, two of which show essentially the same relationship.
• A short conclusion with no numerical evidence.

The audience should be able to understand the investigation in approximately one minute.

Explain how the student should restructure the poster. Identify what information should remain prominent and what could be removed or reduced.

Solution 4

The student should reduce the background and method sections, select one main results graph, and make the conclusion more prominent.

The research question should appear near the top so the audience immediately understands the investigation.

The method should summarise the essential procedure, important variables and controlled conditions. The five photographs are unnecessary unless a particular image explains an important feature of the experimental setup.

The 48 measurements do not all need to appear in a large table. The main graph should communicate the overall pattern, while the complete dataset can be provided separately if the task permits.

The two graphs showing essentially the same relationship should be reduced to one. The remaining graph should occupy the largest area because it contains the central evidence.

Most importantly, the conclusion needs to identify the actual result. It should state the direction of the observed relationship and include relevant measurements.

The tempting approach is to retain everything because it demonstrates the amount of work completed. However, the poster’s purpose is to communicate the investigation, not reproduce every stage of the student’s report.

Question 5

A student investigates whether catalyst A or catalyst B produces a faster reaction.

They also conduct trials at two temperatures, 20°C and 40°C.

Their summary data are:

All measurements were obtained using the same method.

The student combines all trials for each catalyst and creates a two-column graph.

Their calculations give:

For catalyst A:

\[ \frac{9(0.10)+1(0.40)}{10} =0.13\ \mathrm{s^{-1}} \]

For catalyst B:

\[ \frac{1(0.08)+9(0.35)}{10} =0.323\ \mathrm{s^{-1}} \]

The student concludes:

“Catalyst B produces a faster reaction than catalyst A.”

However, when the results are separated by temperature, catalyst A has the higher mean rate at both temperatures.

Which conclusion should the poster communicate? Explain why the pooled graph is misleading, identify the limitation in the temperature-specific comparisons, and propose a better experimental design.

Solution 5

The student cannot conclude that catalyst B is faster overall from the pooled graph. The comparison is distorted by the different temperature distributions between the two catalysts.

Look at the results separately.

At 20°C:

• Catalyst A: 0.10 s⁻¹.
• Catalyst B: 0.08 s⁻¹.

At 40°C:

• Catalyst A: 0.40 s⁻¹.
• Catalyst B: 0.35 s⁻¹.

The mean rates are higher for catalyst A at both temperatures.

So why does the pooled graph suggest the opposite?

The answer is the unequal distribution of experimental conditions.

Catalyst A has nine trials at the lower temperature and only one at the higher temperature. Catalyst B has the opposite distribution.

Because temperature strongly affects reaction rate, the pooled averages are not comparing equivalent sets of conditions.

Catalyst B appears faster overall largely because most of its trials were conducted at the higher temperature.

This is an example of how combining data from different groups can reverse the apparent relationship. It is sometimes called Simpson’s paradox.

However, there is another problem.

The temperature-specific comparisons are not equally reliable. Catalyst B has only one trial at 20°C, while catalyst A has only one trial at 40°C.

Those single measurements provide no information about repeat-to-repeat variability within those particular conditions.

Therefore, the results point towards catalyst A having the higher mean rate at each temperature, but they do not establish a reliable overall ranking of the catalysts.

The poster should use a grouped graph showing catalyst and temperature separately. It should display the number of trials for each condition and avoid combining all observations into two misleading averages.

A better investigation would use a balanced design:

1. Conduct the same number of trials for catalyst A at 20°C and 40°C.
2. Conduct the same number of trials for catalyst B at both temperatures.
3. Keep other experimental conditions constant.
4. Randomise the order of trials where practical to reduce systematic effects associated with run order.
5. Compare the catalysts separately at each temperature, considering the variability between repeated measurements.

A suitable poster conclusion would be:

“The available mean results are higher for catalyst A at both tested temperatures. However, the unequal number of trials across conditions prevents a reliable overall comparison. Further balanced testing is required before identifying which catalyst produces the faster reaction.”

This is a much stronger scientific conclusion than simply choosing whichever bar is tallest.

The important lesson is that a graph can be mathematically correct and still communicate a misleading comparison if the experimental design is ignored.

A good scientific poster makes the reasoning behind an investigation visible. Once you can select the right question, visual and supported conclusion, the next step is being able to defend those choices when someone asks why your evidence justifies your interpretation.