Methodological review and detailed guidance for the life cycle interpretation phase

Alexis Laurent*, Bo P. Weidema, Jane Bare, Xun Liao, Danielle Maia de Souza, Massimo Pizzol, Serenella Sala, Hanna Schreiber, Nils Thonemann, Francesca Verones

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Life cycle interpretation is the fourth and last phase of life cycle assessment (LCA). Being a “pivot” phase linking all other phases and the conclusions and recommendations from an LCA study, it represents a challenging task for practitioners, who miss harmonized guidelines that are sufficiently complete, detailed, and practical to conduct its different steps effectively. Here, we aim to bridge this gap. We review available literature describing the life cycle interpretation phase, including standards, LCA books, technical reports, and relevant scientific literature. On this basis, we evaluate and clarify the definition and purposes of the interpretation phase and propose an array of methods supporting its conduct in LCA practice. The five steps of interpretation defined in ISO 14040–44 are proposed to be reorganized around a framework that offers a more pragmatic approach to interpretation. It orders the steps as follows: (i) completeness check, (ii) consistency check, (iii) sensitivity check, (iv) identification of significant issues, and (v) conclusions, limitations, and recommendations. We provide toolboxes, consisting of methods and procedures supporting the analyses, computations, points to evaluate or check, and reflective processes for each of these steps. All methods are succinctly discussed with relevant referencing for further details of their applications. This proposed framework, substantiated with the large variety of methods, is envisioned to help LCA practitioners increase the relevance of their interpretation and the soundness of their conclusions and recommendations. It is a first step toward a more comprehensive and harmonized LCA practice to improve the reliability and credibility of LCA studies.

Original languageEnglish
JournalJournal of Industrial Ecology
Volume24
Issue number5
Pages (from-to)986-1003
ISSN1088-1980
DOIs
Publication statusPublished - 2020

Keywords

  • completeness and consistency checks
  • decision-making
  • ISO
  • life cycle assessment (LCA)
  • result evaluation
  • uncertainty and sensitivity analysis

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