What is a life cycle assessment, and how does it reveal where a product's environmental impact comes from?
Life cycle assessment (LCA): the stages of a product's life (raw material extraction, processing, manufacture, packaging and transport, use, end of life), carbon footprint, embodied energy, and how an LCA guides design decisions to cut impact.
A focused answer to OCR A-Level Product Design on life cycle assessment: the stages from raw material extraction through processing, manufacture, transport, use and end of life, carbon footprint and embodied energy, and how an LCA guides design decisions to reduce environmental impact.
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What this dot point is asking
OCR wants you to know the stages a life cycle assessment considers, the meaning of carbon footprint and embodied energy, and how an LCA guides design decisions to cut impact. An LCA is the tool that tells a designer where a product's impact comes from.
The stages of a life cycle assessment
Carbon footprint and embodied energy
Using an LCA to guide design
The limitations of an LCA
An LCA is only as good as its data and boundaries. Data may be incomplete or estimated; the boundaries chosen (what is counted) affect the result; comparing different kinds of impact (carbon versus toxicity versus water use) is difficult; and a full LCA is time-consuming and costly. A good evaluate answer uses the LCA to prioritise but acknowledges these limits.
Exam-style practice questions
Practice questions written in the style of OCR exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
OCR 20194 marksState the stages of a product's life that a life cycle assessment considers, and explain why a designer carries one out.Show worked answer →
A Component 01 short-answer question. Marks for the stages and for the purpose.
Award marks for the stages, in order: raw material extraction; processing the raw materials into usable materials; manufacture and assembly; packaging and transport (distribution); use (energy, consumables and maintenance during the product's life); and end of life (reuse, recycling, energy recovery or landfill). A designer carries out an LCA to identify where in the life the biggest environmental impacts occur, so the design can be changed to reduce them at the most effective point (for example, if most impact is in the use phase, improving energy efficiency matters most; if it is in materials, choosing a lower-impact material matters most).
A common dropped mark is listing only manufacture and disposal; an LCA covers the whole life, including extraction, transport and use.
OCR 20228 marksDiscuss how a life cycle assessment can lead to better design decisions for an electrical product such as a kettle. Evaluate the limitations of an LCA.Show worked answer →
A Component 02 levels-of-response question (AO3), marked by levels.
A top-level answer applies the LCA to the product and weighs its limits. For a kettle, an LCA usually shows the use phase dominates the impact, because boiling water uses significant electricity over the product's life, so the most effective design changes target energy efficiency: a minimum-fill marker, a well-matched element, good insulation and an auto-off, which cut energy more than changing the body material would. Materials and manufacture also matter (a recyclable single-polymer body, less material), as does end of life (design for disassembly and recycling). The evaluation should weigh the limitations of an LCA: it relies on data that may be incomplete or estimated, the boundaries chosen (what is included) affect the result, comparing impacts of different types (carbon versus toxicity versus water use) is difficult, and it can be time-consuming and costly. A justified conclusion is that an LCA is valuable for focusing design effort where impact is greatest (the use phase for a kettle), provided its data and boundaries are sound.
Markers reward using the LCA to prioritise design changes and weighing its limitations with a judgement.
Related dot points
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Sources & how we know this
- OCR A Level Design and Technology (H404-H406) specification — OCR (2017)