Recording Evidence Clearly

Overview

Lesson 3 of 4 in the unit Predict, Observe, Explain. Students repeat or compare the class investigation fairly, control key variables, record time-based observations, and use evidence to write an observational paragraph.

Learning intentions

• WALT repeat or compare an investigation while keeping key variables fair.
• WALT organise observations and measurements in a clear table or labelled diagram.
• WALT describe what happened over time using scientific observations.
• WALT explain a pattern using evidence from our results.

Success criteria

• I can identify what I changed, measured and kept the same.
• I can record observations at suitable times in a table or labelled diagram.
• I can use precise words, measurements or sketches to describe what I observed.
• I can write a paragraph that uses evidence from my results.

Curriculum links

• Nature of Science: investigating in science by making careful observations, repeating tests and using evidence.
• Nature of Science: communicating in science through tables, diagrams, scientific vocabulary and written explanations.
• Science capabilities: observing, interpreting representations, using evidence and engaging with science.
• Key Competencies: managing self, participating and contributing, thinking, and using language, symbols and texts.

Lesson structure (50 minutes)

1. 0–5 minutes – Reconnect and hook Open with the investigation hook and learning intentions. Display a photograph or simple before-and-after image from the previous investigation and ask: “How can we be more confident that our result is fair?” Students briefly share what they predicted and observed in Lesson 2.

2. 5–12 minutes – Model fair testing and recording Use the fair-test model and recording example to revisit the independent variable (what is changed), dependent variable (what is measured or observed), and controlled variables (what is kept the same). Model one results table with headings such as time, what I notice, and measurement. Emphasise recording what happened, not what students expected to happen.

3. 12–17 minutes – Plan the repeat or comparison In groups of four or five, students identify the variable they will change or compare and agree on at least two variables to control. They predict what they may notice, then explain their plan to another group for a quick fairness check. Prompt: “If we changed two things, would we know which one caused the result?”

4. 17–32 minutes – Repeat the investigation and record evidence Distribute the evidence-recording worksheet. Groups carry out the agreed repeat or comparison, recording observations at the set times or stages. One student manages materials, one conducts the test, one records, and one checks the controlled variables; rotate roles if practical. Encourage labelled sketches, numbers where appropriate, and specific words such as larger, darker, slower, warmer, more bubbles or no visible change.

5. 32–40 minutes – Organise and compare results Groups check their table or diagram for missing information and compare their result with the previous trial or another group’s result. Use the results-check prompts to ask: “What stayed the same?”, “What changed?”, “What pattern can you see?” and “Which observation is your strongest evidence?” Students circle or highlight two pieces of evidence.

6. 40–47 minutes – Write an observational paragraph Students complete the paragraph on the evidence paragraph section using this structure: “We observed… The evidence was… This happened over time because…” They must include at least two observations or measurements and avoid claiming more than the evidence shows. Invite two groups to read their paragraphs aloud; classmates identify the evidence used.

7. 47–50 minutes – Plenary and check for understanding Return to the plenary questions. Students show with fingers 1–3 how confident they are: 1 = I need help recording evidence, 2 = I can record it with a prompt, 3 = I can explain evidence independently. Collect worksheets and ask one final question: “Why is repeating an investigation useful?”

Resources

• the investigation hook and learning intentions
• the evidence-recording worksheet
• Materials from the previous investigation
• Timer or clock visible to students
• Measuring tools used in the original investigation
• Group role cards or board display
• Pencils, rulers and coloured pencils
• Paper towels or trays for practical work
• Whiteboard and markers

Assessment

• Observe group planning and questioning to assess whether students can identify changed, measured and controlled variables.
• Check tables or labelled diagrams for timed observations, appropriate headings, accurate measurements and clear labels.
• Read the observational paragraph for two evidence-based observations and a conclusion that matches the results.

Differentiation

• Provide a partially completed table, word bank and sentence starters: “At ___ minutes, I observed ___”; “My evidence is ___.”
• Pair students strategically and allow an adult or confident peer to support the recorder; offer speech-to-text or scribing where needed.
• For EAL learners, use gestures, visual examples and orally rehearse the paragraph before writing; accept labelled sketches alongside short sentences.
• Extend confident students by asking them to compare two trials, comment on reliability, and suggest one improvement to make the investigation fairer.