🔧 Year 10 Design & Technology

The GCSE NEA (Non-Exam Assessment)

What Is the NEA?

• The NEA is a substantial design-and-make task that you develop over Year 10 and complete in Year 11. It is worth 50% of your GCSE grade. The written exam is the other 50%.
• You choose from a set of contextual challenges released by the exam board in June of Year 10. Your NEA must address the context by designing and making a functional, high-quality prototype.
• Portfolio: a design folder (paper or digital) that documents your investigation, ideation, development, testing, and evaluation. This is the evidence of your design thinking — not just the final product.

Assessment Criteria

• Identifying and investigating design possibilities (up to ~45 marks): context analysis, user research, mood boards, initial market research, existing products analysis (ACCESSFM)
• Producing a design brief and specification: a clear, ambitious brief and a measurable specification with criteria for success
• Generating design ideas (up to ~45 marks): a wide range of initial ideas (quantity AND quality), annotated with justifications of decisions
• Developing design ideas (up to ~45 marks): testing and refining ideas, prototype models, digital modelling, resolving problems
• Realising design ideas (up to ~45 marks): the quality of the final make — precision, finish, functionality
• Analysing and evaluating (up to ~20 marks): testing against the specification, user evaluation, wider evaluation of sustainability and social impact

The Design Process

Investigation and Research

• ACCESSFM: used to analyse existing products. Aesthetics (does it look good?), Cost (how much does it cost to make?), Customer (who is it for?), Environment (impact on environment?), Size (dimensions, weight), Safety (is it safe?), Function (what does it do? how does it work?), Materials (what is it made from? why?)
• Primary research: surveys, interviews, user observations, physical testing of materials. Directly gathered by you.
• Secondary research: books, internet, existing product reviews, design briefs from companies. Gathered by others.
• Design specification: a list of measurable criteria your product must meet. Each criterion should be testable. A good specification uses specific, measurable targets: not "it should be light" but "it should weigh less than 200g." Connects to your research.

Generating and Developing Ideas

• Ideation: generate a wide range of very different initial concepts — quantity first. 3D sketching, exploded views, orthographic drawings, thumbnail sketches.
• Annotation: every drawing must be annotated — explain WHY you have made each design decision. Relate back to the specification and user research.
• Modelling: cardboard, foam, clay, 3D printing, CAD modelling — used to explore form and function before committing to final materials. "Fail fast, learn fast."
• Prototyping: a more refined model to test specific aspects (ergonomics, mechanisms, materials). Document the results — what worked, what needed changing.

Materials & Their Properties

Metals

• Ferrous metals (contain iron, will rust): mild steel (low carbon, cheap, easy to work, widely used), stainless steel (iron + chromium — corrosion resistant, used in cutlery, medical instruments, architecture), cast iron (hard, brittle, compression strength — engine blocks, manhole covers)
• Non-ferrous metals (no iron, won't rust): aluminium (lightweight, corrosion resistant, good conductor — aircraft, cans, packaging), copper (excellent conductor of electricity and heat — wiring, pipes, PCBs), brass (copper + zinc — decorative, easy to cast, corrosion resistant — fittings, musical instruments), titanium (lightweight, strong, biocompatible — aerospace, medical implants)
• Alloys: a mixture of two or more metals (or a metal and a non-metal). Usually have better properties than pure metals. Steel = iron + carbon. Bronze = copper + tin. Solder = tin + lead (or tin + silver for lead-free).
• Properties: hardness, toughness (resistance to sudden impact), tensile strength (resistance to pulling apart), compressive strength (resistance to squashing), malleability (ability to be shaped by hammering), ductility (ability to be drawn into wire), conductivity (thermal and electrical)

Polymers (Plastics)

• Thermoplastics: can be softened by heating and reshaped repeatedly. Recyclable. Examples: HDPE (milk bottles, cutting boards), LDPE (carrier bags, film), PET (drinks bottles, polyester fabric), Polypropylene (food containers, hinges), Polystyrene (packaging, expanded foam), PVC (pipes, window frames, cable insulation), Acrylic (PMMA — laser cutting, displays — rigid, transparent, can be polished to optical clarity)
• Thermosets: permanently set when first heated and moulded — cannot be re-softened. Not recyclable. Examples: melamine formaldehyde (kitchen worktops, tableware — hard, heat resistant), urea formaldehyde (electrical fittings), epoxy resin (adhesive, GRP matrix), polyester resin (GRP matrix)
• Key processes: vacuum forming (thermoforming sheet over a mould using atmospheric pressure), injection moulding (melted thermoplastic injected into a closed mould under pressure — for complex 3D shapes in high volume), blow moulding (for hollow bottles), extrusion (continuous profile shapes — pipes, window frames), compression moulding (thermosets)

Timber

• Hardwoods: from deciduous (broad-leaved) trees. Slow-growing — more expensive. Generally denser and more durable. Oak (strong, attractive grain — furniture, flooring), Ash (tough, flexible — tool handles, sports equipment), Mahogany (easy to work, attractive — furniture, musical instruments), Balsa (very light and weak — models), Teak (very hard, weather-resistant, oily — garden furniture, boat decks)
• Softwoods: from coniferous (evergreen, needle-leaved) trees. Faster-growing — cheaper and more sustainable if managed. Pine/Scots pine (construction timber, furniture), Spruce (aircraft, musical instruments), Larch (external cladding), Cedar (lightweight, aromatic — pencils, lining for wardrobes)
• Manufactured boards: made from timber that has been broken down and reconstituted. More stable (less likely to warp or split), can be made in larger sheets. Plywood (layers of veneer, alternating grain — strong in all directions), MDF (medium density fibreboard — smooth surface, no grain, easy to machine, not waterproof), Chipboard/particleboard (lower quality, used in flat-pack furniture), OSB (oriented strand board — structural use in construction)

Textiles, Papers, and Composites

• Natural fibres: cotton (soft, absorbent, washable), wool (warm, elastic, fire-resistant), silk (strong, smooth, luxurious), linen/flax (strong, cool, absorbent)
• Synthetic fibres: polyester (durable, quick-drying, shape-retaining), nylon (strong, abrasion-resistant — ropes, tights, toothbrush bristles), acrylic (wool-like feel, colourfast — knitwear), Kevlar (incredibly strong, bullet-proof vests)
• Composites: two or more materials combined to exploit the best properties of each. GRP/fibreglass (glass fibres + polyester resin — boat hulls, car body panels, wind turbine blades), CFRP (carbon fibre reinforced polymer — very strong and light — F1 cars, aerospace, cycle frames), concrete (aggregate + cement — strong in compression but weak in tension; reinforced concrete adds steel for tensile strength)

Manufacturing Processes

Wasting Processes (Material is removed)

• Sawing: hand saws (rip saw along grain, cross-cut saw across grain, tenon saw for joints, coping saw for curves), power saws (circular saw, jigsaw, band saw), metal saws (hacksaw, junior hacksaw)
• Filing and sanding: shaping and finishing. Files remove more material; sandpaper (with increasingly fine grits: 80 → 120 → 240 → 400) smooths surfaces.
• Drilling: pillar drill (accurate vertical holes), hand drill. Twist drill bits for metal and wood. Spade/flat bits for large holes in wood. Countersink bit creates a recess for a screw head.
• Turning (lathe): spinning the workpiece while a cutting tool removes material to create cylindrical forms. Can produce extremely precise cylindrical shapes. CNC turning is computer-controlled.
• Milling: a rotating cutter removes material in multiple axes. Can create flat surfaces, slots, and complex profiles. CNC milling allows precise 3D shapes.

Forming and Joining

• Bending (metal): line bending (heating a strip of acrylic/thermoplastic along a line and bending to the required angle), press braking (machine bends sheet metal to precise angles), rolling (continuous curves)
• Casting: molten metal poured into a mould. Sand casting (one-off, rough surface), die casting (high pressure into a steel mould — high volume, smooth surface), investment/lost-wax casting (complex shapes)
• Permanent joining: welding (fusion of metal — MIG, TIG, arc), soldering (low-temperature — used for electronics), riveting (permanent mechanical fastening)
• Semi-permanent joining: nuts and bolts, machine screws (can be undone for maintenance)
• Temporary joining: snap fits, bayonet fittings (require no tools)
• Adhesives: wood glue (PVA), epoxy resin (2-part: resin + hardener, bonds almost anything), contact adhesive, superglue (cyanoacrylate), hot glue (EVA — thermoplastic)

Scales of Production

• One-off (jobbing) production: a single unique item made to a specific customer's requirements. Examples: bespoke suits, bridges, custom furniture. High skill, high cost per unit, long lead time.
• Batch production: a specific quantity of identical items made at once. When one batch is complete, the machines are set up for the next batch. Examples: bread, clothing, books. Moderate cost and skill. Allows some product variety.
• Mass production: large numbers of identical products made continuously using assembly lines. Highly automated. Examples: cars, electronics, food. Low cost per unit, low skill (specialised tasks), high initial capital investment. Just-In-Time (JIT) management reduces stock holding.
• Continuous/flow production: non-stop production 24/7, often for liquid or gas products. Oil refining, paper making, chemical production. Very high capital investment, virtually no human labour on the line, very low unit cost.

CAD/CAM & Digital Technology

Computer-Aided Design (CAD)

• CAD software (e.g. AutoCAD, Fusion 360, SolidWorks, Onshape): allows precise 2D drawings and 3D models to be created, modified, and shared digitally
• Advantages: easy to edit (unlike physical drawings), can simulate how a product will work (FEA — finite element analysis for structural stress), can check for component clashes in assemblies, can generate manufacturing drawings automatically, can directly drive CAM machines
• Parametric modelling: design dimensions are defined by parameters that can be changed — updating one parameter automatically updates the whole model
• 2D CAD: used for flat patterns, PCB layouts, laser cutting and vinyl cutting files
• 3D CAD: used for 3D printing, CNC routing, mould design

Computer-Aided Manufacturing (CAM)

• Laser cutter: uses a high-powered laser to cut or engrave sheet materials (acrylic, plywood, card, leather, fabric). Very precise. Works from a 2D vector file. Cannot cut metals at standard school specification.
• 3D printer (FDM — Fused Deposition Modelling): melts plastic filament (usually PLA or ABS) and deposits it layer by layer. Slow, but can create almost any 3D form. Perfect for rapid prototyping and complex geometries.
• Vinyl cutter: cuts shapes from vinyl sheet for stickers, graphics, and stencils. Works from a vector file.
• CNC router/miller: a computer-controlled cutting tool that moves in X, Y, and Z axes to cut complex 2D or 3D forms in wood, acrylic, foam. Very precise. High setup time but excellent repeatability.
• CNC lathe: computer-controlled turning. Creates precise cylindrical forms.
• PCB milling: used to make printed circuit boards by milling away copper from a copper-clad board

Sustainability in Design

The Six Rs

• Rethink: is this product necessary? Is there a fundamentally different, more sustainable way to meet this need? (e.g. digital music vs physical CDs)
• Refuse: choose not to use harmful or unnecessary materials/products. Refuse to design for planned obsolescence.
• Reduce: use less material. Lightweight design. Reduce energy consumption in manufacture and use. Use less packaging.
• Reuse: design products that can be used multiple times. Refillable, repairable, adaptable.
• Recycle: design products from recyclable materials. Use mono-materials (single polymer) that are easier to recycle. Avoid mixed composites that are hard to separate.
• Repair: design for repairability. Avoid permanent adhesive joints. Make components replaceable. Right to repair movement.

Life Cycle Assessment (LCA)

• LCA traces the environmental impact of a product through its entire life: raw material extraction → manufacture → distribution → use → end of life (disposal, recycling, or reuse)
• Cradle-to-grave: whole life cycle analysis including disposal. Most materials end up in landfill. High environmental cost.
• Cradle-to-cradle: designing so that end-of-life materials become the raw material for a new product — a circular flow rather than a linear one. The ideal of the circular economy.
• Carbon footprint: the total greenhouse gas emissions throughout the life cycle. Designers consider the embodied carbon of materials (the energy used to produce them) as well as operational carbon (energy to use the product).
• Ethical considerations: fair trade (workers paid fairly and in safe conditions), conflict minerals (some electronics use minerals from war zones — e.g. coltan for tantalum capacitors), planned obsolescence vs longevity