You will learn
- List the parts of a plan.
- Choose what to change, measure and keep the same.
- Write a clear method.
- Include safety.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- An investigation needs a plan.
- We choose what to change and what to measure.
- We keep other variables the same.
- We plan the method and the safety.
Words to know
a planned test to find an answer
the steps of a test
the thing we change
the thing we measure
1. Discover: The paper plane plan
Dela wants to find out whether the length of a paper plane’s wings changes how far it flies. She plans: change the wing length, measure the distance, keep the paper, launch and thrower the same. She lists her steps and her safety rules.
Think: What will she measure?
2. Understand: Planning
Idea 1: Parts of a plan
A plan includes the question, prediction, equipment, method, what to record and safety. Writing the steps helps us repeat the test.
Idea 2: Variables
The independent variable is the one thing we change. The dependent variable is what we measure. All other variables are kept the same to keep the test fair.
Idea 3: Method and safety
Number the steps. Say how many times you will repeat. Add safety rules. A good method could be followed by someone else.
3. Worked examples
Example 1 (I show you): Variables
Wing length and distance.
- Change: wing length.
- Measure: distance.
- Keep: paper, throw.
Answer: Change wing length; measure distance.
Example 2 (We do it together): Method
Steps.
- Fold plane.
- Throw from line.
- Measure.
Answer: Number the steps clearly.
Example 3 (You try): Safety
Throwing planes.
Show the steps and answer
- Not at faces.
- Clear area.
- Adult watching.
Answer: Plan safety first.
Did you know?
The world record for a paper plane flight is over 69 metres.
Why this matters
A good plan makes the investigation fair, safe and repeatable.
4. Explore: Write a plan
Plan an investigation on how far paper planes fly.
- Write a question.
- List variables.
- Write the method.
- Add safety.
Think about it: what did you notice?
What did you notice? Planning made the test clearer.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- We change the ___ variable.
- We measure the ___ variable.
- Keep other things the ___.
- A method is the ___.
Guided practice
Question 1. What is an investigation?
A planned test.
Question 2. What is the independent variable?
What we change.
Question 3. What is the dependent variable?
What we measure.
Independent practice
Level 1: Start
- What is an investigation?
- What is the independent variable?
- What is the dependent variable?
- What is a method?
- Why plan safety?
Level 2: Grow
- Why keep variables the same?
- Why number steps?
- Why repeat?
Level 3: Stretch
- Write a full plan.
- Name variables for a test.
- Swap and review plans.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
What would you investigate?
Show a sample answer
Plant growth or plane flight.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Change one thing.
Fix: They help.
8. Lesson summary and revision card
- I can list the parts of a plan.
- I can choose what to change, measure and keep the same.
- I can write a clear method.
- I can include safety.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- An investigation needs a plan.
- We choose what to change and what to measure.
- We keep other variables the same.
- We plan the method and the safety.
11. Next lesson
Next lesson: Introduction to fair tests. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- List three plan parts. [3 marks]
- Name the two variable types. [2 marks]
- Why keep others the same? [1 mark]
- Write three method steps. [3 marks]
- Safety rule? [1 mark]
Total: 10 marks.
Marking guide and model answers
- Any three [1 each]
- Independent [1]; dependent [1]
- Fair test [1]
- Three clear steps [1 each]
- Any [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is an investigation?
- What is the independent variable?
- What is the dependent variable?
- What is a method?
- Why plan safety?
- Why keep variables the same?
- Why number steps?
- Why repeat?
- Write a full plan.
- Name variables for a test.
Homework
Write a plan for an investigation you could do at home: question, variables, method, safety.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is an investigation? | A planned test. | 1 |
| 2. What is the independent variable? | What we change. | 1 |
| 3. What is the dependent variable? | What we measure. | 1 |
| 4. What is a method? | Steps of a test. | 1 |
| 5. Why plan safety? | Stay safe. | 1 |
| 6. Why keep variables the same? | Fair. | 1 |
| 7. Why number steps? | Clarity. | 1 |
| 8. Why repeat? | Check. | 1 |
| 9. Write a full plan. | Plan. | 1 |
| 10. Name variables for a test. | List. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 A planned test.; 2 What we change.; 3 What we measure.; 4 Steps of a test.; 5 Stay safe.. Level 2: 1 Fair.; 2 Clarity.; 3 Check.. Level 3: 1 Plan.; 2 List.; 3 Feedback..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 List the parts of a plan | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Choose what to change, measure and keep the same | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Write a clear method | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Include safety | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Change everything for a test.” Change one thing.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Write a clear plan with variables, method and safety.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns to plan a science investigation. You do not need to be an expert to help.
- Plan a simple test together.
- Ask, “What will we change?”
- Write steps.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: list the parts of a plan; choose what to change, measure and keep the same; write a clear method; include safety.
Prerequisite knowledge. Grade 2 science ideas: observing carefully, making predictions, measuring with simple tools and running simple fair tests.
Materials. Plan sheets, pencils, paper and rulers. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Prepare plan templates. Prepare examples.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Throw a plane and ask, “How could we test what changes the distance?”
Explanation (10 min). Teach planning.
Guided activity (10 min). Learners write plans.
Independent activity (10 min). Learners swap and review.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What do we change? Measure? Keep the same?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Change everything for a test.” Change one thing.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Write a clear plan with variables, method and safety. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 3 Unit 1, topic 5; Next Generation Science Standards, science and engineering practices (asking questions, planning and carrying out investigations, analysing data); Cambridge Primary Science Stage 3, thinking and working scientifically; IB Primary Years Programme, how the world works. These sources informed the lesson.