How do engineers weigh up the environmental, social and economic impact of what they design?
The impact of engineering achievements on society and the environment, and the meaning of sustainability in engineering design.
An SQA National 5 Engineering Science answer on the impact of engineering on society and the environment and what sustainability means, covering positive and negative impacts, the economic, social and environmental factors engineers balance, and design for a long life and recycling.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this key area is asking
The SQA wants you to recognise that engineering changes the world for better and for worse, and to explain what sustainability means and how engineers design with the environment, society and the economy in mind.
The impact of engineering
Engineering has transformed how we live. Clean water systems, electricity, transport, medicine and communication all exist because of engineering. These bring huge positive impacts: longer, healthier lives, faster travel and global communication.
But engineering also has negative impacts. Manufacturing uses energy and raw materials; vehicles and power stations release emissions; and products eventually become waste. A good engineer recognises both sides and tries to maximise the benefits while minimising the harm.
Sustainability in engineering
Engineers improve sustainability in several ways: choosing recyclable or renewable materials, designing products that last longer and can be repaired, making products energy efficient in use, and designing them so they can be taken apart and recycled at the end of life. Reducing the amount of material used (without losing strength) also helps.
The three factors engineers balance
- Environmental factors
- the emissions a product creates, the energy and raw materials it uses, and the waste it generates. Using renewable energy and recyclable materials reduces environmental harm.
- Social factors
- the effect on people - safety, health, jobs created or lost, and quality of life. A new motorway might cut journey times (good) but split a community or increase local noise (bad).
- Economic factors
- the cost to design, manufacture, run and maintain a product, and whether people can afford it. A product that is cheap to make but expensive to run may be a poor long-term choice.
Why this is examined
Context questions reward balanced, structured answers. If a question gives you a product and asks about its impact, work through the environmental, social and economic factors in turn and give a concrete point for each. Avoid one-word answers.
Try this
Q1. State one way a product can be designed to be more sustainable. [1 mark]
- Cue. Use recyclable materials, design it to last longer or be repaired, or make it more energy efficient.
Q2. Give one negative environmental impact of mass-producing electronic devices. [1 mark]
- Cue. Use of scarce raw materials and energy in manufacture, and electronic waste at the end of life.
Q3. Explain why low purchase cost alone does not make a product the best economic choice. [2 marks]
- Cue. Running and maintenance costs over the product's life may be high, so a cheaper-to-buy product can cost more overall than a more expensive but efficient one.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style4 marksAn engineering company is designing a new electric bus. Describe one positive and one negative environmental impact, and one social and one economic factor the engineers must consider.Show worked answer →
The question asks for four separate, clearly labelled points across the three pillars.
Positive environmental impact: the electric bus produces no exhaust emissions at the point of use, improving local air quality.
Negative environmental impact: manufacturing the batteries uses scarce raw materials and energy, and the batteries must eventually be disposed of or recycled.
Social factor: cleaner, quieter transport improves quality of life for people living on bus routes.
Economic factor: the buses cost more to buy than diesel buses, but may cost less to run and maintain over their lifetime.
Markers reward four valid points, one in each category, each phrased as an impact or factor rather than a bare statement of fact.
SQA N5 style2 marksExplain what is meant by designing a product to be sustainable, and give one design feature that improves sustainability.Show worked answer →
Markers want a definition plus a concrete feature.
Sustainable design means meeting present needs while minimising harm to the environment and conserving resources, so that future generations are not disadvantaged.
One feature: using recyclable materials, or designing the product so it can be repaired and lasts a long time, so fewer replacements are made and less waste is created.
Markers reward a definition that mentions resources or the environment and the future, plus a genuine design feature (recyclable materials, durability, energy efficiency, or easy disassembly).
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