Life-cycle design — Design, 14–17 years
A product has a life before, during and after use. Life-cycle design asks where its materials come from, how much energy it needs, how long it lasts and what happens when its first user is finished with it.
Idea
Life-cycle design considers a product from raw material to final disposal or reuse. It includes extraction, transport, manufacture, sale, use, repair and what happens afterwards. The aim is not to pretend every impact can disappear, but to make better choices across the whole journey instead of improving only one stage.
Why
A product may look sustainable in use while causing most of its harm before it reaches the user. Another may be recyclable but so short-lived that people replace it often. Life-cycle thinking grew from the problem of shifting damage out of sight. It asks designers to compare the whole effect, not celebrate one attractive feature.
Worked example
Compare two water bottles. Bottle A is a thin single-use bottle: it uses little material each time but is discarded after one drink. Bottle B uses more material, yet is washed and used 300 times. If one reusable bottle replaces 300 disposable ones, the designer must then check washing water, transport and whether it can be repaired or recycled. The answer depends on the whole journey.
Common trap
A reasonable mistake is to call a product sustainable because it is made from recycled material or can be recycled. That feature may help, but it does not describe the energy used to make it, how long it lasts or whether it is actually collected. One positive stage cannot prove that the whole life cycle is better.
Where it is used
Companies use life-cycle thinking when designing phones, clothes, buildings, food packaging and transport services. A phone designed with replaceable batteries may last longer and create less waste, even if it needs a different case. The method is most useful when a product uses substantial resources or is made and discarded in very large numbers.
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