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This study presents the implementation of Multi-Criteria Decision-Making(MCDM) methodologies, particularly the fuzzy Technique for Order of Preferenceby Similarity to Ideal Solution (TOPSIS), in prioritizing technosignatures(TSs) for the Search for Extraterrestrial Intelligence (SETI). By incorporatingexpert opinions and weighted criteria based on the established Axes of Merit,our analysis offers insights into the relative importance of various TSs.Notably, radio and optical communications are emphasized, in contrast to darkside illumination and starshades in transit. We introduce a new axis, ScaleSensitivity, designed to assess the variability of TS metrics. A sensitivityanalysis confirms the robustness of our approach. Our findings, especially thehighlighted significance of artifacts orbiting Earth, the Moon, or the Sun,indicate a need to broaden evaluative criteria within SETI research. Thissuggests an enhancement of the Axes of Merit, with a focus on addressing theplausibility of TSs. As the quest to resolve the profound question of oursolitude in the cosmos continues, SETI efforts would benefit from exploringinnovative prioritization methodologies that effectively quantify TS searchstrategies.

Deciding technosignature search strategies: Multi-criteria fuzzy logic to find extraterrestrial intelligence