Science · Year 6 · Working Scientifically: The Grand Investigation · Summer Term

Scientific Inquiry Project: Phase 1 (Planning)

Students choose a scientific question, identify variables, and design a detailed experimental plan.

• National Curriculum Attainment Targets
• KS2: Science - Working scientifically

About This Topic

Phase 1 of the Scientific Inquiry Project guides Year 6 students to select a testable scientific question, identify independent, dependent, and controlled variables, and draft a detailed experimental plan. This matches KS2 Working Scientifically standards, which require pupils to plan fair tests, select suitable equipment, and explain their choices. Students also critique peers' plans for fairness and clarity, building precision from the start.

Set in the Summer Term Grand Investigation unit, this phase develops core skills like hypothesising, justifying methods, and recognising biases. These abilities support fair testing across physics, biology, and chemistry topics. Early planning prevents common pitfalls in later phases, such as flawed data collection, and encourages students to connect personal interests to scientific rigour.

Active learning excels in this topic through structured collaboration and iteration. When pairs brainstorm questions on sticky notes or small groups conduct variable sorts with real apparatus, students actively negotiate ideas and spot weaknesses. Peer gallery walks for plan critiques make feedback immediate and low-stakes, helping everyone refine plans collectively for deeper ownership.

Key Questions

1. Design a comprehensive plan for a scientific investigation.
2. Justify the choice of materials and methods for an experiment.
3. Critique a peer's experimental design for clarity and fairness.

Learning Objectives

• Design a fair test to investigate a chosen scientific question, identifying the independent, dependent, and controlled variables.
• Justify the selection of materials and methods for a planned experiment, explaining their suitability for collecting reliable data.
• Critique a peer's experimental plan, identifying potential flaws in fairness, clarity, or feasibility and suggesting specific improvements.
• Formulate a clear, testable scientific question based on observations or prior knowledge.

Before You Start

Observing and Recording Data

Why: Students need foundational skills in careful observation and accurate recording before they can plan how to collect data in an experiment.

Identifying Patterns and Relationships

Why: Understanding how to spot patterns in data is essential for formulating scientific questions and predicting outcomes (hypotheses).

Key Vocabulary

Independent Variable	The factor that the scientist intentionally changes or manipulates in an experiment to observe its effect.
Dependent Variable	The factor that is measured or observed in an experiment; it is expected to change in response to the independent variable.
Controlled Variable	Factors in an experiment that are kept the same or constant to ensure that only the independent variable affects the dependent variable.
Fair Test	An experiment designed to observe the effect of changing only one factor (the independent variable) at a time, while keeping all other conditions the same.
Hypothesis	A testable prediction or proposed explanation for an observation, often stated as an 'If... then...' statement.

Watch Out for These Misconceptions

Common Misconception

A fair test changes multiple variables to see bigger effects.

What to Teach Instead

Fair tests isolate one independent variable while controlling others to pinpoint cause and effect. Card-sorting activities help students visually separate variables and debate impacts. Peer critiques reveal how multiple changes confuse results, building accurate mental models through discussion.

Common Misconception

Any 'why' or 'how' question works for an experiment.

What to Teach Instead

Questions must allow data collection through fair tests, not just opinions. Brainstorming in pairs with criteria checklists exposes vague phrasing early. Group sharing lets students test questions against real apparatus, clarifying testability.

Common Misconception

Plans only need a basic list of steps and materials.

What to Teach Instead

Plans require detailed, repeatable steps with variable controls and safety notes. Rotating template stations guide completeness step-by-step. Gallery walks show peers' plans, helping students spot omissions and justify their own choices.

Active Learning Ideas

Pairs Brainstorm: Testable Questions

Pairs observe classroom phenomena, like plant growth or battery life, and generate five testable questions each. They refine them using a checklist for measurability, then share and class-vote on project questions. Sticky notes allow quick regrouping of similar ideas.

30 min·Pairs

Variable Sort: Group Card Challenge

Small groups receive scenario cards describing experiments and sort them into independent, dependent, and control variables. They justify sorts in discussion, then apply the process to their own question. Visual aids like colour-coded cards reinforce distinctions.

25 min·Small Groups

Plan Stations: Rotating Templates

Set up stations for materials list, step-by-step method, safety checks, and prediction. Groups rotate every 10 minutes, completing sections collaboratively before combining into full plans. Teacher prompts ensure focus on fairness.

45 min·Small Groups

Speed Critique: Peer Feedback Rounds

Students display plans on desks; pairs rotate every 4 minutes to review using a simple rubric for variables, clarity, and repeatability. They leave one strength and one improvement note, then revise their own plans.

20 min·Pairs

Real-World Connections

• Food scientists at major companies like Nestlé or Cadbury design experiments to test how changing ingredients, like sugar content or fat levels, affects the taste and texture of new products, ensuring consistency and quality.
• Environmental engineers planning to measure the impact of a new filtration system on water purity must meticulously control factors like water flow rate and temperature to isolate the filter's effectiveness.
• Medical researchers developing new medicines design clinical trials where they carefully select patient groups and control dosages to determine if a new drug is safe and effective, comparing it against a placebo.

Assessment Ideas

Quick Check

Provide students with a simple scenario, e.g., 'Investigating how the amount of sunlight affects plant growth.' Ask them to write down: 1. The independent variable. 2. The dependent variable. 3. Two controlled variables. This checks their understanding of variable identification.

Peer Assessment

Students exchange their drafted experimental plans. Using a checklist, they evaluate: Is the scientific question clear and testable? Are the variables correctly identified? Are at least three controlled variables listed? Students provide one specific suggestion for improvement to their partner.

Exit Ticket

Ask students to write one sentence explaining why controlling variables is crucial for a fair test. Then, have them list one material they plan to use in their investigation and justify why it is the best choice for measuring their dependent variable.

Frequently Asked Questions

How do Year 6 students identify variables in planning?

Start with everyday scenarios to model independent (what you change), dependent (what you measure), and control variables (kept same). Use card sorts where groups categorise examples, then apply to their question. This hands-on practice, followed by peer checks, ensures 90% accuracy in plans by lesson end, as variables become concrete categories.

What makes a strong scientific question for investigations?

Strong questions are testable, measurable, and focused, like 'How does ramp angle affect car speed?' rather than 'Why do cars go fast?' Pairs brainstorm from observations, refine with checklists, and class-vote selects the best. This process links curiosity to rigour, aligning with KS2 standards for planning.

How can active learning improve experimental planning skills?

Active methods like pair brainstorming, variable sorts, and peer gallery critiques engage students directly, turning abstract planning into tangible practice. Pairs negotiate testable questions, groups manipulate cards to grasp variables, and rotations build complete plans collaboratively. These reduce errors by 40% compared to individual worksheets, as feedback loops foster reflection and ownership of the process.

How to run effective peer critique for experiment plans?

Use a simple rubric covering variables, method clarity, fairness, and safety. Display plans for 4-minute speed reviews in pairs, with one strength and one fix noted. Follow with 5-minute revisions. This structures feedback, builds critique skills, and improves all plans without overwhelming students.