  This study presents the implementation of Multi-Criteria Decision-Making
(MCDM) methodologies, particularly the fuzzy Technique for Order of Preference
by Similarity to Ideal Solution (TOPSIS), in prioritizing technosignatures
(TSs) for the Search for Extraterrestrial Intelligence (SETI). By incorporating
expert 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 dark
side illumination and starshades in transit. We introduce a new axis, Scale
Sensitivity, designed to assess the variability of TS metrics. A sensitivity
analysis confirms the robustness of our approach. Our findings, especially the
highlighted significance of artifacts orbiting Earth, the Moon, or the Sun,
indicate a need to broaden evaluative criteria within SETI research. This
suggests an enhancement of the Axes of Merit, with a focus on addressing the
plausibility of TSs. As the quest to resolve the profound question of our
solitude in the cosmos continues, SETI efforts would benefit from exploring
innovative prioritization methodologies that effectively quantify TS search
strategies.
