Why Engineers Should Think About the End Before They Design the Beginning

Engineering traditionally begins with requirements: what must the product do, what loads must it withstand, what must it cost, and how will it be manufactured? Spencer Salter of JLR believes another question should move much closer to the start of that list: what happens when the product reaches the end of its useful life?

His argument is rooted in circularity. Before a project begins, engineers should consider how the resources going into it can be extracted and reused. That sounds like an end-of-life question, but in practice, it changes decisions made at the very beginning of the design process.

Material combinations are one example. A lightweight multi-material structure may perform brilliantly in service, but if the joining method makes separation impractical, recovery becomes difficult. Adhesives, coatings and mixed polymers can create similar problems. A decision that improves assembly today can make reuse, repair or recycling considerably harder years later.

The same applies to product architecture. Components that are accessible can be inspected, repaired or replaced. Components that are permanently embedded may turn a minor failure into a whole-product replacement. Standard fasteners, modularity, documentation, and material identification can all influence whether value remains recoverable at the end of the first life.

Thinking about the end also exposes assumptions about service life. If a product can be upgraded rather than replaced, remanufactured rather than scrapped, or returned to a controlled material loop, the environmental and commercial models change. In some sectors, the recovered material or component may itself become part of the business case.

That commercial element matters. Circular design is more likely to scale when recovery, remanufacture, or extended service life creates measurable value for the manufacturer or customer. Engineers can help make that value possible by preserving material quality, designing components for inspection and reuse, and creating traceability that makes the condition and history of a recovered part easier to understand.

None of this removes the traditional engineering priorities. Safety, cost, performance and manufacturability still matter. Circularity becomes another requirement to be balanced with them, which is exactly why it has to enter the process early. Once tooling is committed, qualification is complete, and the supply chain is established, fundamental design changes become far more difficult.

Salter describes engineering as the task of translating science into things people can use and enjoy. The next extension of that responsibility is to consider what happens after use. A successful product cannot be judged only by how well it performs on day one if the materials, energy and complexity built into it create an avoidable problem at the end.

For engineers, this is not an invitation to solve an abstract environmental problem. It is a design challenge with practical parameters: disassembly time, repairability, material recovery, contamination, residual value, traceability and the availability of recycling or remanufacturing routes.

The most important shift is simply the order in which the questions are asked. End-of-life should not begin when a product is already obsolete. It should begin while the architecture is still flexible enough for engineering decisions to make a difference.