Sustainable Product Design Flashcards

Question 1

What is the basic goal of sustainable product design?

Accepted Answer

Sustainable product design aims to meet people's needs and deliver useful function while reducing environmental harm and protecting social and economic well-being over the product's full life. It asks designers to consider where materials come from, how the product is used, and what happens when it is no longer wanted.

Question 2

What does the phrase triple bottom line mean in sustainable design?

Accepted Answer

The triple bottom line is a framework that judges a product or business by three dimensions: environmental, social, and economic performance. Designers using it ask whether a product protects natural systems, treats workers and users fairly, and remains financially viable. A design that scores well on only one dimension can still fail elsewhere.

Question 3

Why do designers focus on the use phase of a product?

Accepted Answer

Designers focus on the use phase because many products consume significant energy, water, or consumables while people operate them. A washing machine uses electricity and water each time it runs, so efficiency choices made during design affect its impact for years. Designing for lower use-phase demand can yield substantial environmental gains.

Question 4

Why is it useful to ask what need a product truly serves?

Accepted Answer

Asking what need a product serves encourages designers to find the least resource-intensive way to meet it. A drill owner really wants holes, so a service, a shared tool, or a smaller tool may satisfy the need with less material. This reframing is a core early step in sustainable design.

Question 5

What is dematerialization in the context of product design?

Accepted Answer

Dematerialization means delivering the same function with less material input. Designers pursue it by thinning components, using lighter structures, combining parts, or replacing physical products with digital or service alternatives. The result is fewer raw materials extracted and less waste generated per unit of value provided.

Question 6

What does it mean to design for durability, and why does it reduce impact?

Accepted Answer

Designing for durability means making a product resist wear, damage, and failure so it stays in service for longer. Because much of the environmental burden of many products comes from making them, a longer working life spreads that burden over more use. Durable design also reduces replacement purchases and the waste they create.

Question 7

What is planned obsolescence and why do sustainable designers avoid it?

Accepted Answer

Planned obsolescence is the deliberate design of a product to become outdated, fail, or lose desirability within a set period. Sustainable designers avoid it because it drives early replacement, increases material use, and fills landfills with products that still have useful life. Instead, they aim for reliability, upgradeability, and clear support for repair.

Question 8

Why is it important to consider the user's behavior when designing a product?

Accepted Answer

User behavior influences how long a product lasts, how it is maintained, and whether it is disposed of properly. A designer who ignores habits may create a product that is easily damaged, or thrown away after a short time. Designers study expected use, provide clear instructions, and make desirable behaviors the easiest choice.

Question 9

What is life cycle thinking in sustainable product design?

Accepted Answer

Life cycle thinking means considering every stage a product passes through, from raw material extraction and manufacturing to distribution, use, and end of life. It prevents designers from optimizing one stage while unknowingly shifting burdens to another. Looking across the whole cycle reveals where the largest impacts actually occur.

Question 10

What is a life cycle assessment and what does it do?

Accepted Answer

A life cycle assessment is a structured method for quantifying the environmental inputs and outputs of a product across its life cycle. It follows defined steps: setting the goal and scope, compiling an inventory of energy and materials, assessing potential impacts, and interpreting the results. It helps designers compare alternatives on evidence.

Question 11

How does cradle-to-grave analysis differ from cradle-to-gate analysis?

Accepted Answer

Cradle-to-grave analysis covers the full life of a product, from raw material extraction through disposal. Cradle-to-gate analysis stops when the product leaves the factory gate, so it omits transport to customers, use, and end of life. Designers choose the boundary that matches their question, but cradle-to-gate results should not be presented as complete.

Question 12

What is a functional unit and why must comparisons use one?

Accepted Answer

A functional unit is a measure of the performance a product delivers, such as one year of lighting for a room. Comparisons need one because two options may deliver different service, so comparing their raw impacts alone can mislead. Expressing both options per functional unit puts them on equal footing.

Question 13

What is a hotspot in life cycle assessment, and how is it used?

Accepted Answer

A hotspot is a stage, process, or material that contributes a disproportionately large share of a product's measured impact. Identifying hotspots lets designers focus effort where changes will matter most. Hotspots are identified from the results of an assessment, so they depend on the data and boundaries chosen.

Question 14

Why can a product that looks green on one measure still have a larger total impact?

Accepted Answer

A single indicator captures only one kind of impact, so a product can score well on it while worsening others. For example, a material may use less energy to produce but generate more water pollution or land use change. Reviewing several impact categories together is needed to avoid this problem shifting.

Question 15

What is the difference between primary and secondary data in life cycle work?

Accepted Answer

Primary data is collected directly from the company, supplier, or process being studied. Secondary data comes from databases, published studies, or industry averages. Primary data is more specific but costly to gather, while secondary data is faster to use but may not match the product.

Question 16

How does life cycle thinking help a designer choose between two materials?

Accepted Answer

Life cycle thinking lets a designer compare materials by their impacts across sourcing, processing, use, and disposal rather than by cost or weight alone. A lighter material may need energy-intensive processing, while a heavier one may last longer or be easier to recycle. Comparing both over the full cycle shows which performs better.

Question 17

What is a renewable material, and does renewable always mean sustainable?

Accepted Answer

A renewable material is one that can be replenished by natural processes within a timescale relevant to human use. Renewable does not automatically mean sustainable, because harvest rates, land use, water demand, and chemical inputs can still cause harm. A material's sustainability depends on how it is sourced and managed.

Question 18

What does recycled content mean, and why do designers distinguish pre-consumer from post-consumer content?

Accepted Answer

Recycled content is the share of a material that was previously used or processed and reclaimed rather than newly extracted. Pre-consumer content comes from manufacturing scrap that never reached a customer, while post-consumer content comes from products that were used and discarded. Designers often value post-consumer content more because it shows a closed loop.

Question 19

Why do designers consider embodied energy when choosing materials?

Accepted Answer

Embodied energy is the total energy used to extract, process, and transport a material before it becomes part of a product. Designers consider it because two materials with similar performance can differ greatly in the energy needed to produce them. This helps reveal impacts that appear in upstream stages.

Question 20

What are the main concerns with toxic or hazardous substances in product materials?

Accepted Answer

Toxic or hazardous substances can harm workers during manufacture, users during everyday use, and ecosystems when products are disposed of or recycled. Designers address these concerns by avoiding substances of known concern, substituting safer alternatives, and checking materials against recognized restricted-substance lists. Early screening is cheaper than redesigning after problems appear.

Question 21

Why do mixed-material products pose challenges for recycling?

Accepted Answer

Mixed-material products are hard to recycle because recyclers must separate components that are often bonded, glued, or molded together. Separation is costly, and contaminants from one material can reduce the quality of the recovered stream. Designers reduce these problems by using fewer material types, choosing compatible materials, and avoiding permanent bonds where possible.

Question 22

What is the difference between biodegradable and compostable?

Accepted Answer

Biodegradable means a material can be broken down by microorganisms into natural substances, but it does not specify how fast or under what conditions. Compostable means a material breaks down within a composting process into compost, within a defined time and under specified conditions. Designers should check the conditions and whether local collection exists.

Question 23

Why is material traceability important in sustainable product design?

Accepted Answer

Traceability lets a designer know where materials came from, how they were processed, and what conditions surrounded their production. Without it, claims about sourcing, recycled content, or chemical safety cannot be verified. Good traceability also supports supplier accountability and makes it easier to respond quickly if a substance of concern is found later.

Question 24

How can a designer use a material's durability and maintenance needs when choosing it?

Accepted Answer

Designers should match material durability to the expected product lifetime and the conditions it will face, such as moisture, abrasion, or heat. A material that resists these conditions may avoid early replacement, while one that needs frequent cleaning, coating, or chemical treatment may add hidden impacts during use.

Question 25

What is a circular economy in the context of product design?

Accepted Answer

A circular economy keeps products, components, and materials in use at their highest value for as long as possible. In product design, this means planning for repair, reuse, remanufacturing, and recycling so that materials return to productive use rather than becoming waste. It contrasts with a linear model of take, make, and dispose.

Question 26

What is design for disassembly and why does it matter?

Accepted Answer

Design for disassembly means arranging a product so its parts can be separated efficiently using common tools and without destroying the components. It matters because repair, upgrading, and recycling all depend on getting parts out intact. Standard fasteners, accessible joints, and clear sequencing help make disassembly practical.

Question 27

Why do designers prefer snap fits or mechanical fasteners over permanent adhesives?

Accepted Answer

Snap fits and mechanical fasteners can be released without damage, allowing repair and separation at end of life. Permanent adhesives bond parts together, often making disassembly impractical and forcing recyclers to shred or discard components. Mechanical joints may add some cost or weight, but they keep the product open to maintenance and recovery.

Question 28

What is modularity in product design and what benefits does it offer?

Accepted Answer

Modularity means dividing a product into functional modules that can be replaced, upgraded, or serviced independently. This allows users to fix a single failed module instead of discarding the whole product, and it lets manufacturers update features without new hardware. Modular design also simplifies sorting materials at end of life.

Question 29

What does design for repair involve beyond making parts removable?

Accepted Answer

Design for repair includes making spare parts available, providing diagnostic and service information, and choosing components that can be fixed rather than replaced. It also considers tool requirements, access to fragile areas, and whether a user can complete a fix safely. Removability alone does not guarantee a product will be repaired in practice.

Question 30

What is remanufacturing and how does it differ from simple recycling?

Accepted Answer

Remanufacturing returns a used product to like-new condition by disassembling it, restoring or replacing worn parts, and reassembling it to meet performance standards. Recycling instead breaks products or components down into raw material that is then used to make new items. Remanufacturing keeps more of the original value in the product.

Question 31

How do standardized components and interfaces support circular design?

Accepted Answer

Standardized components and interfaces allow parts from one product to fit another model or be swapped with an equivalent part. This widens the pool of reusable components, simplifies inventory for repair shops, and reduces the need to manufacture new parts for every variant. Independent repairers can also work with them.

Question 32

What is a take-back program and how does it support circularity?

Accepted Answer

A take-back program is a system in which a manufacturer or retailer collects products at the end of their use for repair, reuse, remanufacturing, or recycling. Designers support these programs by making products easy to identify, sort, and inspect. Collection gives materials a planned route back into production, reducing demand for virgin resources.

Question 33

What is a design brief and why should it include sustainability criteria?

Accepted Answer

A design brief is a written statement of the problem, users, constraints, and goals that guides a project. Including sustainability criteria, such as expected lifetime, recycled content targets, or repairability requirements, makes these goals measurable from the start. Criteria added late often cost more to meet, so they work best when set early.

Question 34

What is a carbon footprint and what does it measure?

Accepted Answer

A carbon footprint is a measure of the greenhouse gas emissions associated with a product, service, or activity, expressed as carbon dioxide equivalent. Other greenhouse gases are converted into this common unit so they can be added together. A carbon footprint covers only climate change, so it should be read alongside other impact measures.

Question 35

Why do designers use standardized environmental declarations when communicating impacts?

Accepted Answer

Standardized environmental declarations present product information in a consistent format, so buyers can compare products on the same basis. They typically report results from a defined assessment method and state the scope and assumptions used. Consistent reporting also discourages selective claims that highlight one favorable number while hiding others.

Question 36

What is greenwashing and how can designers avoid it?

Accepted Answer

Greenwashing is the practice of making environmental claims that are vague, unsupported, or misleading relative to a product's actual impact. Designers avoid it by making only claims they can substantiate, specifying the scope and evidence behind each claim, and avoiding terms like natural or eco-friendly without definition. Specific claims build more trust.

Question 37

What is a sensitivity analysis and why is it useful in design evaluation?

Accepted Answer

A sensitivity analysis tests how much results change when key assumptions, such as material source, transport distance, or product lifetime, are varied. It is useful because a conclusion that holds only under one optimistic assumption may be fragile. Showing which inputs matter most helps designers decide where to gather better data.

Question 38

How can an assumed product lifetime change the results of an impact assessment?

Accepted Answer

An assumed lifetime changes how the production impact is spread across the product's service. If a product is assumed to last twice as long, its manufacturing burden per year of use is roughly halved, while use-phase impacts accumulate over more years. Designers should state lifetime assumptions openly and test their sensitivity.

Question 39

What is a trade-off in sustainable design, and how should it be handled?

Accepted Answer

A trade-off occurs when improving one aspect of a product worsens another, such as a lighter material that requires more energy to produce. Trade-offs should be handled by making the competing impacts visible, weighing them against the design goals and context, and documenting the reasoning. Ignoring trade-offs usually leads to hidden problems later.

Question 40

How do designers decide when a product is good enough for sustainability goals rather than perfect?

Accepted Answer

Designers usually decide by comparing options against stated criteria, using the best available evidence, and checking whether a change delivers a meaningful improvement. Setting clear targets gives a threshold to judge progress against. Sustainable design is an ongoing process of improvement rather than a single state of perfection.

Sustainable Product Design Flashcards

1Foundations of sustainable design

2Life cycle thinking and assessment

3Material selection and health

4Design for disassembly and circularity

5Evaluating and communicating environmental impact

Learning Resources