Sustainability Language

Life Cycle Assessment & Product Footprinting

Functional unit

A functional unit is the quantified function of a product system used as the reference basis for comparison in life cycle assessment.

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Definition

A functional unit is the quantified function of a product system used as the reference basis for comparison in life cycle assessment.

Overview

What it means in practice

Functional unit should be read as an assessment-method term. Its meaning depends on the study goal, system boundary, data quality and comparison being made.

In practice, users should state the boundary, material route, measurement method and evidence. That keeps functional unit clear enough to support review without turning it into a broad claim.

Why it matters

Functional unit matters because LCA language shapes what is counted, compared and communicated. Clear definitions help readers see whether a result is methodological, measured or assumed.

Common misconception

A common error is to treat Functional unit as neutral or automatic. The stronger approach is to explain the modelling choice and how it affects interpretation.

Review questions

What boundary or material route is being described? What evidence supports the term? What condition, timeframe or modelling choice should be stated before a reader relies on it?

Review

Public comments appear only after editor acceptance. Draft comments stay in the review queue.

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How people contribute

Reviewers choose the definition or an overview paragraph, leave a comment or replacement, and attach evidence or a source link.

How comments are used

Editors compare reviewer cards side by side. AI may help find agreement, conflicts, unsupported claims and possible source issues.

What gets published

Only an editor-accepted synthesis changes the public page. Reviewer identities are shown only with consent and verification.

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Review board

Comment on a specific line. Each reviewer stays separate until an editor accepts a merged draft.

1Separate reviewer cards

Each person comments on the definition or overview in their own draft card, with role, evidence and suggested wording kept together.

2AI comparison

AI can compare comments against the current text, flag conflicting claims, surface missing evidence and identify where reviewers agree.

3Editor synthesis

An editor merges compatible suggestions into a draft change, checks sources, records disagreements and decides what can be published.

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Definition
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Before you submit

This proposal follows the editorial and AI-assistance rules. The live definition will not change until an editor accepts it.

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