This poster introduces Standard Production Variants (STPVs), a harmonised life cycle inventory (LCI) framework designed to support consistent environmental assessments of agricultural production in Switzerland. Using standardised cradle-to-farm-gate system boundaries and a parametric modelling approach based on reusable and combinable modular components, STPVs capture differences in environmental impacts across agricultural products, production regions and management systems. Their integration into food-system and sectoral models enables the assessment of alternative agri-food scenarios, considering agricultural production, trade, and food consumption. By improving data consistency, transparency and comparability, STPVs provide a robust basis for identifying environmental trade-offs and informing sustainability transitions in agri-food systems.