Chapter 07 · Materials & footprintsLife Cycle Assessment & Product Footprinting
Primary data
Definition
Primary data is data collected directly from the specific process, site, supplier or activity being assessed.
References
This reference provides supporting context for how “Primary data” is defined and used.
Overview
What it means in practice
Primary data should be read as a life-cycle and product-footprinting term. Its meaning depends on the study goal, scope, data source, method and interpretation context.
In practice, users should state the boundary, baseline, data source and method. That keeps primary data useful as a reference without overstating the result.
Why it matters
Primary data matters because footprinting language determines what is counted, compared and communicated. Clear definitions make assumptions visible and reduce the risk of misleading comparisons.
Common misconception
A common error is to treat Primary data as a neutral technical label. The stronger approach is to explain the modelling choice and how it changes the result.
Review questions
What boundary, baseline or comparison is being used? What evidence supports the term? What assumption or limitation would change how a reader interprets it?
How it is used
In professional practice, “Primary data” helps designers, manufacturers, procurement teams, life-cycle practitioners and waste managers describe or assess data collected directly from the specific process, site, supplier or activity being assessed. It is commonly encountered in product design, procurement, footprinting, material selection, production and end-of-life decisions.
A credible application identifies the product system, life-cycle stages, functional unit, geography, timeframe and measurement method.