Executive Summary

Not all loneliness measures are equally reliable. With billions in public health resources at stake, EU policymakers need transparent guidance on which measurement instruments produce trustworthy, comparable data across member states. The LONELY-EU traffic light rating system evaluates measures across three critical dimensions—cross-EU comparability, construct validity, and content coverage—enabling evidence-based instrument selection. Current assessment reveals that while several measures perform strongly on individual dimensions, none yet achieves green ratings across all three—a measurement gap the EU SIL Index is being designed to address while providing clear guidance on using available instruments appropriately. This framework ensures policymakers can distinguish between measures suitable for EU-wide monitoring and those requiring more cautious interpretation.

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