Fab City Full Stack Metrics Framework: An Actionable Methodology for Multi-Scalar Implementation

Implementing impact metrics in Fab Labs and the Fab City network requires more than a list of indicators. It requires a coherent structure that links local activity with wider urban, regional, ecological, and planetary systems. The Fab City Full Stack Metrics Framework provides that structure through seven system layers, five territorial scales, and four impact pillars: environmental, social, economic, and governance. Its value lies in making local interventions measurable without disconnecting them from the broader systems they seek to influence. The framework becomes operational when implementation starts at community scale, focuses on a feasible core of indicators, and embeds data collection in routine organisational practice. The framework draws on systems thinking, multiscalar sustainability assessment, life cycle analysis, material flow accounting, circular economy research, and governance studies to ensure that indicators remain analytically coherent across scales and dimensions. An actionable methodology follows through five stages: boundary definition, activity mapping, indicator selection, data protocol design, and review. The framework further distinguishes between high-feasibility indicators, which can be derived from records labs already maintain, and lower-feasibility indicators that require dedicated infrastructure and should be deferred to later implementation phases. When implemented through this staged methodology, it supports rigorous measurement, organisational learning, accountability, and comparability across the Fab Lab and Fab City network.