Enríquez de Salamanca , Álvaro2026-03-182026-03-182025-09-30Enríquez-de-Salamanca, Á. (2025). Alternatives in environmental impact assessment: a taxonomy. Integrated Environmental Assessment and Management, 22(2), 362–375. https://doi.org/10.1093/inteam/vjaf1351551-377710.1093/inteam/vjaf135https://hdl.handle.net/20.500.14352/134115The consideration of alternatives is central to environmental impact assessment (EIA), as decisions cannot be made without options to choose from. Despite its significance, the treatment of alternatives in EIA practice has inadequacies, driven by factors such as a lack of interest, predefined options, and a limited understanding of the possibilities. An essential requirement for alternatives is that they must be reasonable. We identify three types of unreasonable alternatives—false, contrived, and subtle—which may distort the EIA process. To address ambiguities in existing literature, we propose a taxonomy classifying alternatives into seven groups: implementation, spatial, timing, functional, design, constructive, and operational, answering the questions why, where, when, what, and how. The aim of this taxonomy is to enhance the consideration of alternatives in EIA practice by improving knowledge of the existing possibilities. Early integration of alternatives, particularly during the scoping phase, and a proactive approach are essential to strengthening EIA; otherwise, the process risks becoming a mere environmental authorization rather than a robust decision-making tool.engjournal article1551-3793https://doi.org/10.1093/inteam/vjaf135metadata only access502/504Alternatives in environmental impact assessmentEnvironmental impact assessment practiceReasonable alternativesTaxonomy of alternativesMedio ambiente naturalEcología (Biología)2391 Química Ambiental2506.04 Geología Ambiental2505.03 Geografía de Los Recursos Naturales