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Volunteerism drives sustainable development and social cohesion, yet official statistical systems fail to capture its full contribution. Existing metrics focus narrowly on participation rates and basic economic value, overlooking broader individual and societal benefits. This paper presents the methodological framework for the Global Index of Volunteer Engagement (GIVE), a composite index developed by the University of Pretoria, the United Nations Volunteers (UNV), and the International Labour Organisation (ILO). GIVE adopts a multidimensional approach across four equally weighted dimensions: Value to the Individual, Value to the Community, Value to the Economy, and the Enabling Environment. We outline the framework’s conceptual foundation, data mapping, normalization to a 0-100 scale, and its capacity to accommodate both survey and administrative data. To assess robustness, we conducted a Monte Carlo simulation study using 10 synthetic datasets representing heterogeneous country contexts and 500 replications, comparing nine specifications with different weighting and aggregation methods. Results indicate that country orderings remain robust across specifications. 

While arithmetic final aggregation generally minimized numerical error, with the GM+AM specification yielding the lowest mean
absolute percentage error (5.22%), we recommend AM+GM aggregation, as it satisfies the commonly used 10% accuracy benchmark (MAPE = 9.64%) while retaining within-dimension indicator compensability and limiting cross-dimension substitutability. We discuss implications for National Statistical Offices, including integrating survey modules, aligning with SDG monitoring frameworks, and building capacity in lower-resource settings. Finally, we outline a Phase 2 roadmap (2027-2029) to roll out GIVE across 60-100 countries to establish a globally comparable evidence base.