The Level Concept distinguishes four levels of life cycle assessment for passenger cars based on intended use and data granularity. Level 1 uses generic data for strategy and research; Level 2 combines specific and generic data for product development; Level 3 uses primary data for specific vehicle models in official reporting; Level 4 uses primary data across entire supply chains. Levels 3 and 4 follow fixed methodologies ensuring comparability, while Levels 1 and 2 permit multiple methodology combinations.