The big idea: Design for disassembly asks whether the product can be taken apart again — for repair, for upgrade, and for recycling.
It is decided almost entirely by the joints, and by whether the shortest-lived part can be reached without destroying anything.
Five ways of joining, and only one of them genuinely temporary.
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| Change | Why it matters | What it costs |
|---|---|---|
| Screws or released clips instead of adhesive | The product can be opened without destroying it, so a repair is possible at all | A few seconds per joint in assembly, and a fastener to buy |
| The shortest-lived part reachable first | A battery, a filter or a seal should be the first thing reached, not the last | It constrains the layout, and sometimes the styling |
| One fastener type throughout | A repairer needs one tool, and cannot put the wrong screw in the wrong hole | Almost nothing — this is the rare change that helps assembly too |
| Materials marked and grouped | A recycler can sort them, and a mixed-material assembly can be separated before shredding | A moulded symbol, which is free once it is in the tool |
| No bonded mixed-material sandwiches | Two materials glued face to face cannot be separated at all, so both are lost | It rules out some constructions, and usually costs a little mass |
| Published service information | A repair that nobody knows how to do does not happen | Documentation, and a manufacturer that accepts repair as legitimate |
Find the shortest-lived part: In almost every powered product it is the battery. In a vacuum cleaner it is the filter and the belt; in a kettle, the seal.
If that part is buried behind a sonic weld, the whole product is scrapped when it fails — so the single most useful question in this statement is what fails first, and how deep is it?
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| Gain | Who it is for |
|---|---|
| Repair | The user, who keeps a working product instead of buying another — and the largest environmental saving available, because it avoids a whole new product |
| Upgrade | The user again: more memory, a bigger battery, a new sensor, without replacing the housing and everything in it |
| Recovery of materials | The recycler, who can separate and sort rather than shred a mixed lump into low-value fragments |
| Compliance | The manufacturer: right-to-repair and end-of-life rules are tightening, and a product designed shut is a product that becomes unsellable |
| Reputation | A product that can be repaired is a reason to buy that brand again, which is a commercial argument rather than an ethical one |
And the reason it is often ignored: Design for disassembly costs assembly time, which is a cost the manufacturer pays on every unit, for a benefit somebody else receives years later.
That asymmetry is exactly why it is regulated rather than left to the market — and saying so is a stronger answer than asserting that designers should care.
How this is tested — outlining the advantages of design for disassembly and applying it. It comes up two ways:
Paper 1 — multiple choice
- Identify the change that improves disassembly.
- Choose the part that should be reachable first.
Paper 2 — analysing a product
- Explain how a product could be redesigned for disassembly.
- Outline the advantages of design for disassembly for a named product.
The trap: Arguing only that it is good for the environment. Name the shortest-lived part, say how deep it is buried, and give the change that reaches it.
IB-style questionExplain[6 marks]
A cordless vacuum cleaner is sonically welded shut, with a glued-in battery pack. Explain how it could be redesigned for disassembly.
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