Activity 01
Pairs: Paper Towel Test Planner
Pupils in pairs brainstorm a fair test for paper towel absorbency: list brands to compare, measure water drops absorbed, control towel size and water volume. They draw labelled steps and predict results. Pairs present to class for quick feedback.
Design a fair test to see which paper towel is most absorbent.
Facilitation TipDuring the Paper Towel Test Planner, circulate and ask each pair, ‘Which variable are you changing? How will you keep everything else the same?’ to reinforce clarity.
What to look forPresent students with a scenario: 'Sarah wants to test which brand of biscuit is crunchiest. She uses a different amount of milk to dunk each biscuit. What is wrong with her test? What should she do differently?'
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Activity 02
Small Groups: Ramp Speed Critique
Groups review a flawed plan for testing toy car speeds on ramps, spot uncontrolled variables like car weight or push strength. They rewrite for fairness, test briefly, and note improvements. Share revisions on whiteboard.
Explain why it's important to change only one thing in an experiment.
Facilitation TipFor the Ramp Speed Critique, give groups only one minute to list flaws in a flawed plan before they redesign it, creating urgency to spot unfairness.
What to look forAsk students: 'Imagine we are testing which toy car rolls fastest down a ramp. What are three things we MUST keep the same for a fair test? What is the ONE thing we will change?'
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Activity 03
Whole Class: Fair Test Gallery Walk
Display pupil-drawn plans for a plant growth test. Class walks around, uses sticky notes to critique fairness and suggest changes. Vote on best plan, then trial it together to check predictions.
Critique a simple investigation plan for fairness.
Facilitation TipSet a 3-minute timer for the Fair Test Gallery Walk so pupils focus on one variable change at a time while moving between posters.
What to look forGive each student a card with a simple investigation plan, e.g., 'To test which plant grows tallest, I will give Plant A 100ml of water and Plant B 200ml of water.' Ask them to write one sentence explaining why this test is not fair.
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Activity 04
Individual: My Variables Chart
Each pupil completes a chart for a soap bubble test: one change (soap amount), same factors (water volume, bowl size), measure (bubble size). They self-check against success criteria before partnering to refine.
Design a fair test to see which paper towel is most absorbent.
What to look forPresent students with a scenario: 'Sarah wants to test which brand of biscuit is crunchiest. She uses a different amount of milk to dunk each biscuit. What is wrong with her test? What should she do differently?'
RememberUnderstandApplyRelationship SkillsSelf-Management
Generate Complete Lesson→A few notes on teaching this unit
Teach fair testing by letting pupils experience the consequences of poor planning. Avoid long explanations; instead, let them test flawed ideas, see messy results, and then revise. Research shows that trial-and-error followed by reflection builds deeper understanding than direct instruction alone.
Successful learning looks like pupils confidently explaining which variable to change, keep the same, and measure in their tests. They should critique peers’ plans with specific reasons and adjust their own investigations after feedback.
Watch Out for These Misconceptions
During the Paper Towel Test Planner, watch for pupils who try to control too many variables without realizing they must change only one.
Ask, ‘Which variable must change to answer your question? How will you keep the rest exactly the same?’ and have them cross out extra controls on their plan.
During the Ramp Speed Critique, watch for pupils who believe multiple changes make a test more interesting or valid.
Remind them to focus on fairness by asking, ‘Does changing more than one thing tell us which factor made the difference?’ and have them highlight the single changed variable in red.
During the Fair Test Gallery Walk, watch for pupils who skip repeats or measurements in their notes.
Use the poster prompts to guide them: ‘How many times will you test each towel? What will you measure with?’ and ask them to add these to their feedback.
Methods used in this brief