The big idea: The guide names four strategies: longevity, upgradability, disassembly and dematerialization.
Each is a set of concrete design decisions rather than an attitude — and longevity comes first, because doubling the time in use halves everything else.
Each strategy as decisions you can point at, with the thing that quietly defeats it — then the order they matter in.
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| Strategy | In the design | What defeats it |
|---|---|---|
| Longevity | Wear parts identified and replaceable; surfaces that age well; spares sold for years after the model ends | One unobtainable part — a ten-year product with a five-year spares policy is a five-year product |
| Upgradability | The fast-moving part on its own module; a connector that will not change next year; firmware that works offline | A proprietary connector changed with each model, which turns an upgrade path into a replacement |
| Disassembly | Screws or clips rather than glue; one material per part; fixings reachable in a sensible order; materials marked | A foam-and-fabric laminate or a glued-in battery — one joint can make a whole product unrecoverable |
| Dematerialization | Less mass for the same function; fewer parts; concentrate and refill; a service where the outcome is what was wanted | Thinning a product until it breaks sooner — dematerialization that shortens life is a net loss |
Disassembly is testable: Give a prototype, a screwdriver and a timer to somebody who has not seen it, and record how long it takes to separate the materials and how many tools it needs.
Write it as a specification criterion: "Separated into material streams in under five minutes with standard tools" — a criterion like this survives every later trade-off in a way that a good intention does not.
Dematerialization in real products
Fewer parts
Folding one steel sheet instead of welding many pieces, or moulding clips into a case, removes parts, fixings and assembly steps.
Less material
Generative design removes material where it carries no load: same strength, much lighter tool or bracket.
Lighter all its life
A lighter product needs less energy to transport and use, and leaves less to dispose of.
Undo disposability
Refill or replace only the part that runs out (a cartridge, a battery) and keep the rest, instead of throwing the whole product away.
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The statement says waste and pollution are eliminated at ALL stages, not just at the end of life.
Most waste never reaches the user: It is generated in extraction, in processing and in the factory — so a designer's decisions upstream matter as much as the end of life.
| Stage | The waste there | The design decision that reduces it |
|---|---|---|
| Extraction and processing | Ore, water and energy far exceeding the mass of the finished part | Recycled feedstock, and less mass for the same function |
| Manufacture | Offcuts, sprues, rejects, solvent and coating overspray | Nest the parts, choose the stock size, design for the process, avoid coatings |
| Distribution | Packaging, and air shipped inside boxes | Flat-pack, nest, stack — and concentrate anything mostly made of water |
| Use | Consumables, energy, and parts replaced early | Refillable rather than disposable; wear parts designed to be replaced |
| End of life | The entire product, if it cannot be separated | Disassembly, marked materials, and a route for it to come back |
Most of the waste is upstream: For many products the material thrown away in extraction and manufacture exceeds the mass of the product several times over.
An answer that only discusses the bin at the end has missed most of the question.
How this is tested — designing products in ways that eliminate waste and pollution. It comes up two ways:
Paper 1 — multiple choice
- Match a design decision to longevity, upgradability, disassembly or dematerialization.
- Identify what defeats a stated strategy.
Paper 2 — analysing a product
- Explain how a named product could be designed to eliminate waste.
- Justify which strategy matters most for a given product.
The trap: Talking only about the end of life. Most waste is generated in extraction and manufacture, before the user ever sees the product.
Explain how a cordless drill could be designed to eliminate waste, using all four strategies.
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