How is a product's full environmental impact assessed, and how can design reduce it at every stage?
Life cycle assessment (raw materials, manufacture, distribution, use and disposal) and design strategies that lower impact across the life cycle, including design for disassembly, repair and recycling.
A focused answer to WJEC A-Level Design and Technology Unit 3 life cycle assessment, covering the five stages of a product's life (raw materials, manufacture, distribution, use, disposal) and how design for disassembly, repair and recycling lowers environmental impact across the whole life cycle.
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What this dot point is asking
WJEC wants you to describe a life cycle assessment, name its stages, and explain how design choices reduce impact across the whole life, including design for disassembly, repair and recycling. The exam asks you to list the LCA stages and explain how the tool guides better design, and to explain strategies such as design for disassembly. You need the stages, the targeting benefit, and the end-of-life design strategies.
The answer
What a life cycle assessment is
The stages of an LCA
Why an LCA is useful
The value of an LCA is that it shows where the impact actually falls, so design effort is targeted. For many appliances the use phase dominates (electricity over years), so improving efficiency saves most. For packaging, materials and distribution dominate, so lightweighting and recycled content help most. Without an LCA, a designer might optimise the wrong stage.
Designing to reduce impact at each stage
- Raw materials - use less material, recycled content, renewable or responsibly sourced materials.
- Manufacture - choose low-energy, low-waste processes and clean energy.
- Distribution - reduce weight and volume (flat-pack), use less packaging, source locally.
- Use - make products efficient (less energy or water) and durable so they last.
- End of life - design for disassembly, repair and recycling.
Design for disassembly
Examples in context
Example 1. Flat-pack furniture. Designing parts to pack flat cuts the distribution impact (more units per lorry, less fuel and packaging), and cam-and-dowel fixings allow disassembly for repair and recycling, targeting two LCA stages through the design itself.
Example 2. A modular smartphone. Designing the battery and modules to be removed with simple fasteners means the phone can be repaired and the materials recovered cleanly, extending life and improving recycling, a direct application of design for disassembly to the end-of-life stage.
Try this
Q1. List the five stages of a life cycle assessment. [3 marks]
- Cue. Raw material extraction and processing, manufacture, distribution and packaging, use, and disposal or end of life.
Q2. Give two design features that make a product easier to disassemble for recycling. [2 marks]
- Cue. Use screws or clips instead of glue and welds; minimise and clearly mark the types of material so they can be separated cleanly.
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC 20186 marksDescribe the stages of a life cycle assessment and explain how it helps a designer reduce a product's environmental impact.Show worked answer →
A life cycle assessment (LCA) examines the environmental impact of a product across its whole life, and a good answer lists the stages and the benefit.
The stages are: raw material extraction and processing (mining, refining, the energy and waste involved); manufacture (the energy, emissions and waste of making the product); distribution and packaging (transport miles, fuel and packaging); use (energy, water or consumables used over the product's life, and durability); and disposal or end of life (landfill, incineration, recycling or reuse).
An LCA helps the designer by showing where the biggest impacts fall, so effort is focused where it matters most. For example, if the use phase dominates (as for many appliances), making the product more efficient saves more than changing its material; if materials dominate, switching to recycled or renewable materials helps most.
Markers reward the five stages (raw materials, manufacture, distribution, use, disposal) and the benefit (identifies the largest impacts so design effort is targeted effectively).
WJEC 20214 marksExplain how designing a product for disassembly reduces its environmental impact at end of life.Show worked answer →
Designing for disassembly means making a product easy to take apart at the end of its life, for example by using screws or clips instead of adhesives and welds, marking and minimising the variety of materials, and grouping parts so they separate cleanly.
This reduces environmental impact because the different materials can be separated and sorted, so each can be recycled into a good-quality material rather than being contaminated and sent to landfill. It also makes parts easier to remove for repair or reuse, extending the product's life, and makes hazardous components (such as batteries) easy to take out for safe handling.
Markers reward the meaning (easy to take apart, using non-permanent joints and fewer material types) and at least two impacts (clean material separation for recycling, easier repair and reuse, safe removal of hazardous parts).
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Sources & how we know this
- WJEC AS/A Level Design and Technology specification — WJEC (2017)