Designing for maintenance, repair and disassembly, including planned and unplanned obsolescence, modular and repairable design, standardised parts and fastenings, design for disassembly to allow material separation and recycling, and the balance between durability, repairability and cost over a product's life.

What this dot point is asking

Edexcel wants you to explain designing for maintenance, repair and disassembly: planned and unplanned obsolescence, modular and repairable design, standardised parts and fastenings, design for disassembly to allow recycling, and the balance between durability, repairability and cost.

The answer

Planned and unplanned obsolescence

Planned obsolescence boosts sales but wastes resources and frustrates consumers, which is driving "right to repair" expectations and legislation.

Designing for maintenance and repair

Design for disassembly

Design for disassembly (DfD) means the product can be taken apart easily and quickly at end of life. Key principles: use temporary, accessible joints; minimise the number of different materials; keep dissimilar materials separable (avoid bonding metal to plastic permanently); label polymers with recycling codes; and reduce the number and variety of fasteners. This lets recyclers separate materials cleanly for high-value recycling instead of shredding mixed waste.

Balancing durability, repairability and cost

Designers balance competing aims. A very durable, fully repairable, easily disassembled product is the most sustainable, but demountable joints, modular parts and higher-grade materials can add cost, bulk and complexity. The right balance depends on the product: a long-life appliance or vehicle justifies design for repair and disassembly, while the calculation is harder for very cheap, high-volume goods, though legislation increasingly tips it toward repairability.

Examples in context

Some smartphones glue in their batteries (planned obsolescence), while modular phones and laptops with replaceable batteries, standard screws and available spares show design for repair. Washing machines designed for disassembly let a technician swap a worn pump or seal and let recyclers separate steel, copper and plastics cleanly. Furniture with knock-down fittings comes apart for moving, repair and recycling. The growing right-to-repair movement and a circular-economy mindset push designers toward repairable, disassemblable products, and explaining the durability-repairability-cost balance with a worked comparison is exactly what the higher-mark questions reward.

Try this

Q1. Define planned obsolescence. [1 mark]

• Cue. Deliberately designing a product with a limited useful life so it must be replaced (for example a sealed, non-replaceable battery or frequent style changes).

Q2. State two features that make a product easy to disassemble for recycling. [2 marks]

• Cue. Accessible standard fastenings (screws or clips rather than glue or welds), and few different materials kept separate and labelled with recycling codes.

Q3. Explain one drawback of designing for full repairability and disassembly. [2 marks]

• Cue. Demountable joints, modular parts and higher-grade materials can raise cost, bulk or complexity, so the sustainability benefit must be weighed against the added cost.