Life cycle assessment
Life cycle assessment (LCA) is a structured method for compiling inputs and outputs and evaluating potential environmental impacts of a product system across defined lifecycle stages. It sets a goal, scope, functional unit, and system boundary, builds an inventory, assesses impact categories, and interprets results, assumptions, limitations, and uncertainty.
In simple terms
A life cycle assessment connects processes from raw-material acquisition through production, distribution, use, and end of life according to the study's boundary. Ecodesign teams can use its results to compare alternatives, while a material footprint may supply or complement resource-use evidence. Results are expressed relative to a functional unit. Choices about allocation, data quality, geography, time, impact methods, and scenarios can materially change findings. The method does not automatically measure every local, social, or economic outcome.
Why it matters
Looking across the lifecycle helps reveal trade-offs and prevents an improvement at one stage from simply shifting burdens to another place, time, or impact category. Transparent LCA can support product design and policy, but comparisons are credible only when functions, boundaries, data, methods, and review needs are appropriate and disclosed.
Example
A team compares two beverage delivery systems per thousand servings. It includes container production, transport, washing, return losses, recycling, and disposal under stated regional scenarios. Sensitivity tests vary return rates and energy mixes. The result identifies conditions under which each system performs differently instead of declaring one universally preferable.
How it differs
Ecodesign
Life cycle assessment is a method for evaluating potential lifecycle impacts; ecodesign is the practice of integrating environmental considerations into design decisions, often using LCA evidence.
Material footprint
Life cycle assessment can evaluate several impact categories for a defined product system. Material footprint is a specific consumption-based measure of raw material extraction attributed to final demand.