220 3.2 Implications for VSS Organizations Although institutional and informational constraints pose clear challenges, they also highlight areas in which VSS organizations can strengthen their evaluation capacity. One key step is the development of metrics that are aligned both with internal standard requirements and with externally recognized reporting frameworks commonly used in commercial ESG databases. Greater alignment would facilitate the construction of longitudinal datasets tracking participant performance over time and enable comparison with non-participating industry peers. Given their central position within VSS systems, VSS organizations are uniquely positioned to define performance indicators, standardize data collection protocols, and improve data interoperability. Strengthening such data infrastructure would enhance the ability to assess whether participants demonstrate improvement over time or relative to broader industry benchmarks. 3.3 Implications for Companies At the firm level, research has examined the motivations for adopting VSS, yet empirical evidence on the performance consequences of participation remains limited. In particular, it remains unclear whether adoption leads to measurable improvements in environmental, social, governance, or supply chain due diligence, and how such changes relate to broader corporate performance indicators. More systematic monitoring and evaluation would allow companies to assess the returns to participation more rigorously. With improved data availability and clearer measurement frameworks, firms would be better positioned to evaluate whether VSS participation contributes to measurable performance gains and to make informed decisions regarding engagement with different standards. 3.4 Implications for Policymakers Although VSS operate as non-state governance mechanisms, they interact with public regulatory systems and do not function in isolation. A more systematic assessment of effectiveness would provide policymakers with clearer evidence regarding the role of VSS within broader governance architectures. Such evidence may inform decisions about whether and how elements of voluntary standards could complement or inform public policy design. Improved effectiveness evaluation would also support greater coherence between voluntary and regulatory approaches, particularly in areas such as supply chain due diligence and responsible sourcing. In sum, evaluating the effectiveness of VSS in the mining, minerals, and metals sectors involves both methodological challenges and institutional opportunities. By clarifying the structural conditions that shape measurement feasibility and proposing a structured framework
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