selection of materials and components
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of selection of materials and components
- Apply selection of materials and components to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for selection of materials and components first (GCSE Revise summary)
- Key vocab to pre-teach: D&T Exam Tips
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: selection of materials and components
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about selection of materials and components. Then check against the key terms: D&T Exam Tips. Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Before lesson: Read the script below. Pre-teach key vocab: D&T Exam Tips.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: selection of materials and components. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
Mins 0-5 - Hook: "Today: selection of materials and components. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Design and Technology because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look
Start with the revision notes summary, then attempt: Create a simple decision matrix to compare acrylic, polycarbonate and glass for a display cabinet door.
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about selection of materials and components.
Lesson 2: Core Concepts: selection of materials and components
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on selection of materials and components. Check them against the notes below.
Main Content (35 minutes)
Key Fact: Selection criteria: function, aesthetics, cost (material + processing + assembly), availability, sustainability (recyclability, material miles), manufacturability.
Key Fact: Decision matrix: weighted scoring system - list criteria, assign weights, score each option, multiply weight x score, total reveals best choice. Removes bias.
Key Fact: Working properties must match function: frying pan handle needs thermal insulation (thermoset/silicone), not conductivity (metal). Bicycle frame needs strength-to-weight (aluminium/CFRP).
Key Fact: Batch vs mass production affects material choice: mass production justifies injection moulding tooling; batch uses CNC or hand-laid composites.
Key Fact: Environmental considerations: full life cycle - extraction, processing, use phase, end of life. Cradle-to-cradle design aims for zero waste.
D&T Exam Tips: For material selection: 1) Identify relevant criteria, 2) Weight by importance, 3) Score each option, 4) Total and compare, 5) State justified conclusion. This demonstrates AO3 evaluation.
| Term | Meaning | Example |
|---|---|---|
| Functional | Can it do the job? | Performance testing |
| Aesthetic | Does it look right? | Visual/colour matching |
| Manufacturing | Can it be made as designed? | Process feasibility |
| Cost | Is it within budget? | Supplier quotes |
| Sustainability | Is it environmentally responsible? | LCA, certifications |
| Availability | Can it be sourced reliably? | Supplier stock check |
Practice (10 minutes)
Q: Create a simple decision matrix to compare acrylic, polycarbonate and glass for a display cabinet door.
Answer: Criteria with weights: Safety (impact resistance) 5, Transparency 4, Cost 3, Weight 3, Scratch resistance 2. Acrylic: 58. Polycarbonate: 62. Glass: 50. Winner: polycarbonate (best safety and transparency despite higher cost).
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: selection of materials and components
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: D&T Exam Tips. Define each in one sentence.
Main Content (35 minutes)
Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.
Q1: Create a simple decision matrix to compare acrylic, polycarbonate and glass for a display cabinet door.
Answer: Criteria with weights: Safety (impact resistance) 5, Transparency 4, Cost 3, Weight 3, Scratch resistance 2. Acrylic: 58. Polycarbonate: 62. Glass: 50. Winner: polycarbonate (best safety and transparency despite higher cost).
Q2: A designer must choose between aluminium and polypropylene for a kitchen utensil handle. Justify using at least four criteria.
Answer: Function: handle must insulate - PP wins over aluminium. Weight: PP lightweight, aluminium heavier. Cost: PP cheap and easy to mould; aluminium requires die-casting. Durability: aluminium resists staining; PP may stain. Recommendation: PP for budget, aluminium with silicone overmould for premium.
Q3: Explain how production volume (batch vs mass) influences material selection for a plastic product.
Answer: Mass production (100,000+ units): justifies expensive injection mould tooling - thermoplastics very cheap per unit. Batch (50-500 units): tooling cost per unit too high - use CNC, vacuum forming, or 3D printing.
Plenary (5 minutes)
Error Review
Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.
Lesson 4: Exam Practice: selection of materials and components
Duration: 50 minutes
Starter Activity (5 minutes)
Command Words
Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).
Main Content (35 minutes)
Extended Answer
Extended question: Full-Mark Response A company is designing a reusable water bottle for the premium market. Using a decision matrix, compare stainless steel, glass and Tritan across at least five criteria. <div class="
A grade 9 response will: identify criteria with weights - Durability 5, Aesthetics 4, Sustainability 4, Cost 3, Weight 3, Hygiene 3; score each; stainless steel: 84; glass: 72; Tritan: 70; conclude: stainless steel recommended for premium market.
Exam Tips: Justify with SPECIFIC criteria - 'tensile strength of 500 MPa exceeds the requirement of 200 MPa' | Use a decision matrix when asked to compare or evaluate | Consider at least 4 criteria: function, cost, sustainability and one other
Common Errors: Watch Out! Students often make mistakes here. Wrong: The cheapest material is always the best choice because it maximises profit. Correct: Initial cost is only one factor. A cheap material may fail in use (warranty claims), require expensive processing, have limited availability, or be unsustainable. Total cost includes material + processing + assembly + QC + returns + disposal. A more expensive material may reduce total cost by simplifying processing.
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how selection of materials and components connects to another Design and Technology topic you have studied
- Real-world: research one real-world use or example of selection of materials and components
- Critical: "What are the limitations of the models used in selection of materials and components?"
Plenary (5 minutes)
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts - re-run Lesson 2
Homework & Consolidation
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: D&T Exam Tips (10 mins)
- Exam practice: One past-paper question on selection of materials and components from the board websites (15 mins)
- Extension: Explain selection of materials and components to someone else in your own words (10 mins)