A science fair board is the poster that tells the story of your child's experiment to visitors and judges who walk from board to board1. The science fair board only works if the project behind it was a real fair test, so this guide starts with the scientific method, stage by stage, and ends with the tri-fold layout.
One honest note on sources. Our main source, Darci Harland's STEM Student Research Handbook, was written for high schoolers1. What follows is our K-5 version of her method.
How to do a science fair project, step by step
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01Ask a testable question
Rewrite "I wonder..." to start with which, how or what1.
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02Make a hypothesis
What you change, what you measure, what you expect: more, less, farther1.
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03Name the variables
The one thing I change, the one thing I measure, and everything I keep the same1.
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04Run a fair test
Same setup, a plain version to compare, several tries each1.
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05Write down the data
Numbers first, then words for what you saw1.
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06Draw one graph
One idea per graph, every part labeled1.
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07Write the conclusion
Did the test agree? Yes, no or partly, plus what to change next time1.
Harland calls these stages, not steps, because researchers often loop back to rethink or retest1.
Real research can be messy.1
Stage 1: turn a wonder into a testable question
Kids ask why. Harland advises avoiding why questions in a project because they are too broad to test; shrink them into something you can measure1.
Testable questions often begin with How, What, When, Who, or Which.1
- "Why do paper planes crash?"
- "Why does ice melt?"
- "How does a paper clip on the nose change how far my plane flies?"
- "Which melts an ice cube faster: a plate in the sun or in the shade?"
Ask your child: "What could we change, and what could we count or measure?" Harland's four focusing questions: what to study, what to change, what to measure, what tools you need1.
Stage 2 and 3: hypothesis and variables in kid words
A prediction built on what you already know1.
Say it: “What do you think will happen, and why?”The one thing you change on purpose1.
Say it: “What is the one thing we are changing?”What you measure to see the effect1.
Say it: “What will we count or measure?”Everything you keep the same so the test is fair1.
Say it: “What has to stay exactly the same each time?”The plain version with no change, used for comparing1.
Say it: “Which one is our plain version?”Harland says calling a hypothesis "an educated guess" misleads, because it should rest on what you already know1. So read one book first. Then use a frame based on hers: "If the (thing I change) is (changed), then the (thing I measure) will (go up or down)1." Example: "If I add more paper clips to the nose, then my plane will fly a shorter distance."
Stage 4 and 5: run a fair test and collect data
A fair test changes one thing only. Harland's rules: treat every group identically except for the change, include a control, and repeat1. For projects you design, she recommends between 4 and 10 entities in each group1. For a plane project, that can mean 4 to 10 throws per version.
| Paper clips on nose | Try 1 | Try 2 | Try 3 | Try 4 | What I saw |
|---|---|---|---|---|---|
| 0 (control) | EXAMPLE 14 ft | EXAMPLE 12 ft | EXAMPLE 15 ft | EXAMPLE 13 ft | Wobbly, curved left |
| 1 | ____ | ____ | ____ | ____ | ____ |
| 2 | ____ | ____ | ____ | ____ | ____ |
| 3 | ____ | ____ | ____ | ____ | ____ |
Harland treats numbers as the main data, descriptions as backup, and wants observations, not opinions1. "It curved left" is an observation. "It was bad" is not.
Stage 6: make one clear graph
Harland's graph rules fit a seven-year-old too: put the data in order first, communicate only one idea per visual, label everything1. Categories, like clip counts, suit a bar graph1. In K-2, stack one sticker per throw above each clip count.
Stage 7: write a conclusion that stays honest
The experiment proved my hypothesis.
Researchers say a hypothesis is supported or not supported, because one study is too small to prove anything1.
If the hypothesis was wrong, the project failed.
Harland writes that data that do not support a hypothesis are just as valuable as data that do1.
A simple conclusion frame from Harland's three questions: what is true about my data, how do the two variables relate, and do the data support the hypothesis, yes, no or partly1? Add one line on what you would change next time.
How to lay out a science project board
Harland lists the poster parts most fairs request: a descriptive title naming what you studied and the two variables, the hypothesis in a prominent place, background, methods with photos, results with graphs and tables, and conclusions1. Here is our K-5 tri-fold layout.
| Where | Section | What goes in it (K-5 version) |
|---|---|---|
| Top center | Title | Names the thing and both variables: "Paper clips and paper plane distance"1 |
| Left panel | Question and hypothesis | The question, then the if-then prediction, placed prominently1 |
| Left panel | What I already knew | Two or three facts from a book, with the book's title1 |
| Center | What I did | Short steps, the variables, a setup photo1 |
| Center | Results | The data table and one labeled graph1 |
| Right panel | Conclusion | Restate the hypothesis; supported or not, with evidence1 |
| Right panel | Next time | What I would change and my new question |
| Table in front | Notebook and model | The real notebook and the thing you tested, if allowed |
Science fair board ideas that help people read it
- Follow the rules sheet first. Every judged item must be on the board1.
- Type the words. She recommends all poster text be typed, in sizes readable from 5 ft1.
- Use arrows. Arrows show the flow from question to conclusion1.
- Pictures over paragraphs. Photos, figures and tables make it inviting1.
- Label groups by what changed. "2 clips" beats "Group B" on any graph or table1.
Examples of science fair boards: what to look for
Most sample science fair boards and science project board examples online follow the same left, center, right flow. When you browse science fair project board examples with your child, ask: "Can you find the question in five seconds? The answer?" That is the test good science project posters pass.
Scientific method project ideas that work as a fair test
Many popular projects are demonstrations: something fizzes, everyone claps. Add one change and one measurement and a demo becomes a test, following Harland's one-change rule1. Use these as science fair display board ideas too: the change and the measurement become your graph's two axes.
| Demo | Testable question | Change | Measure |
|---|---|---|---|
| Baking soda volcano | How does the amount of vinegar change how high the foam rises? | Spoons of vinegar | Foam height on a taped ruler |
| Candy color spread | Which water temperature makes the colors spread fastest? | Cold, room, warm tap water | Seconds until colors reach the plate's center |
| Paper airplane | How does nose weight change flight distance? | 0 to 3 paper clips | Distance in feet |
Science project board ideas by grade
Can: Say a which-question, predict out loud, count tries, describe what they saw.
Try: Sticker graph, big photos, one sentence per section. You type.
A good science fair display board reads like a short story: what I wondered, what I did, what happened, what it means.
Present it: the two-minute talk
Harland's talk order: hook, what you changed and measured, how you did it, the results (explain what the graph shows before the details), the conclusion, then questions1. And do not end with "That's all I have to say"1. Try: "Next, I want to test..."
STEPS to STEM has children share what they found and what they still wonder about, kept on a "wonder wall"2. Put the next question on your fridge.
Frequently asked questions
What goes on a science project board?
A title naming the variables, the question and hypothesis, background, methods with photos, results with a graph and table, and a conclusion1.
What size are posters for science fair?
Harland lists poster sizes from 36 in. by 36 in. to 40 in. by 60 in., notes tri-fold display boards are commonly requested, and says to check with the organizers before buying1.
What do good science fair display board examples have in common?
Text readable from 5 ft, typed words, arrows that show the flow, and photos, graphs and tables alongside the writing1.
What are easy scientific method experiments for kids?
Anything with one change and one measurement, like nose weight on a paper plane. Keep everything else the same and repeat each version at least 4 times1.
What if the hypothesis was wrong?
Write "not supported" and explain why that might be. Harland counts unsupported results as just as valuable as supported ones1.
Keep exploring
- Ramps, cars and your child's first fair test A toy-car practice run of the fair test.
- Science fair project ideas by grade More questions to pick from, sorted by age.
- "How do you know?" The habit behind a good conclusion.
If you want the next project ready to go
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