What is in WJEC A-Level Design and Technology Unit 1?

Unit 1 Technical Principles is the AS written paper. It covers the classification and selection of materials (papers and boards, timbers, metals, polymers and textiles), the physical and mechanical working properties of materials, the sources, origins and stock forms of materials, the main categories of manufacturing process (wasting, casting and moulding, deforming and reforming, fabrication and joining), surface treatments and finishes, and the 6 Rs and sustainability. These are the technical building blocks examined again, in more depth, at A2 in Unit 3.

How is Unit 1 assessed?

Unit 1 is an AS written examination assessing technical principles. Questions are taken directly from the specification content and mix short factual recall (name a process, define a property) with extended discuss-and-justify questions worth several marks, such as selecting a material or a finish for a given product and justifying the choice. You should be able to describe a key process such as injection moulding step by step.

What is the difference between a thermoplastic and a thermosetting polymer?

A thermoplastic softens when heated and can be reshaped many times because its long chains are held by weak intermolecular forces, so it is recyclable and suits injection moulding and vacuum forming (acrylic, polypropylene, HIPS). A thermosetting polymer sets permanently on first curing because heat or a hardener forms strong cross-links between the chains, so it cannot be re-melted and resists heat (urea formaldehyde, melamine, epoxy resin).

What are the 6 Rs in design and technology?

The 6 Rs are a framework for reducing a product's environmental impact: rethink, refuse, reduce, reuse, repair and recycle. They form a rough hierarchy in which the earlier Rs prevent waste at source and have the greatest impact, while recycling deals with material at end of life. In the exam you apply them concretely to a named product, for example lightweighting a bottle (reduce), making it refillable (reuse) and using a single recyclable polymer (recycle).

Why must timber be seasoned before use?

Freshly felled timber holds a large amount of moisture. Seasoning, by air drying or kiln drying, reduces the moisture content to a stable level in balance with where the timber will be used (around 8 to 12 per cent indoors). Without it the timber would shrink and move in service, causing warping, splitting and open joints, and would be prone to fungal decay. Seasoning also makes timber lighter, stronger and able to hold glue and finishes.

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WJEC A-Level Design and Technology Unit 1 Technical Principles: a complete overview of materials, properties, processes, finishes and sustainability

A deep-dive WJEC A-Level Design and Technology guide to Unit 1 Technical Principles, the AS written paper. Covers classifying and selecting materials, physical and mechanical working properties, sources, origins and stock forms, manufacturing processes, surface treatments and finishes, and the 6 Rs and sustainability, with the named processes and exam patterns WJEC repeats.

Generated by Claude Opus 4.820 min readWJECUpdated 2026-06-16

Reviewed by: AI editorial process; not yet individually human-reviewed

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What Unit 1 actually demands
Classification and selection of materials
Working properties of materials
Sources, origins and stock forms
Manufacturing processes
Surface treatments and finishes
The 6 Rs and sustainability
How Unit 1 is examined
The six topics, dot point by dot point
For the official specification

What Unit 1 actually demands

Unit 1 Technical Principles is the AS written paper, and it sets out the technical knowledge that underpins the whole qualification. It is about materials and making: what materials are, how they behave, where they come from, how they are shaped and finished, and how to do all of that with less environmental harm. The same themes return at A2 in Unit 3 with more depth and more theory, so a secure Unit 1 pays off twice.

This guide walks through the six topics of the unit, then sets out the exam patterns WJEC repeats. Each topic has a matching dot-point page with worked exam questions; this overview ties them together.

Classification and selection of materials

Materials are grouped into five families: papers and boards, timbers (hardwoods, softwoods, manufactured boards), metals (ferrous, non-ferrous, alloys), polymers (thermoplastics, thermosets) and textiles (natural, synthetic, blends). Selection is the examined skill: matching working properties to a product's functional, aesthetic, ergonomic, manufacturing, cost and sustainability requirements, and naming a specific material with a justification.

Working properties of materials

Properties split into physical (density, electrical and thermal conductivity, durability) and mechanical (strength, hardness, toughness, ductility, malleability, elasticity, plasticity). WJEC loves the contrast questions - toughness versus hardness, malleability versus ductility, elasticity versus plasticity - and asks you to justify a material from a product's mechanical demands.

Sources, origins and stock forms

Timber is felled, seasoned and converted; metals are extracted from ores by smelting or electrolysis; most polymers come from the naphtha fraction of crude oil, cracked into monomers and polymerised; fibres are natural or synthetic. Materials are bought in standard stock forms (sheet, bar, tube, section, granules), and designing to stock sizes cuts waste and cost.

Manufacturing processes

Processes group into wasting (turning, milling, laser cutting), casting and moulding (sand casting, injection moulding, vacuum forming, blow moulding), deforming and reforming (bending, pressing, forging, laminating) and fabrication and joining (temporary and permanent joints). The biggest driver of process choice is scale of production: high-tooling automated methods suit large runs, low-tooling methods suit one-offs.

Surface treatments and finishes

Finishes protect, add durability, improve appearance and aid hygiene. Timber takes varnish, paint, stain, oil and wax; metals take painting, galvanising (sacrificial zinc), anodising (a thickened oxide on aluminium), powder coating and electroplating; most polymers are self-finishing. The finish must match the material and the product's environment.

The 6 Rs and sustainability

The 6 Rs - rethink, refuse, reduce, reuse, repair, recycle - are a hierarchy for cutting impact, applied to a named product in the exam. Resources are finite (oil, ores) or non-finite (timber, natural fibres, if managed). Designers control real levers: lightweighting, single recyclable materials, design for disassembly and responsibly sourced (FSC) materials.

How Unit 1 is examined

Unit 1 is an AS written paper on technical principles. Questions come straight from the specification statements, mixing short recall (name, define, state) with extended discuss-and-justify questions worth several marks. Be ready to describe a key process such as injection moulding in ordered steps, to justify a material or finish for a specific product, and to apply the 6 Rs concretely.

The six topics, dot point by dot point

Each topic has a dot-point answer page with worked exam questions and cross-links. Browse them from this unit overview and the subject hub.

For the official specification

WJEC publishes the full specification, past papers and mark schemes at wjec.co.uk. Always revise from the current specification and WJEC's own past papers, because question style is board-specific.

Sources & how we know this

WJEC AS/A Level Design and Technology specification — WJEC (2017)