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LCA studies aim at an integrating system assessment as a comprehensive and holistic approach to prevent tradeoffs and guide users and decision makers for better informed decisions. The total life cycle approach aims at informing and supporting decision making and management support. To better inform the decision making process for product design or product optimization, reliable tools are necessary which mirror the complexity and provide enough concentrated information at the same time. These management tools also need either to be included into the existing technical and economical information at the same time, or, as a minimum, allow interfaces to those other disciplines. Often full LCA studies are too expensive and also to time intensive, as they could really serve as input into decision making. Therefore new approaches are inevitable to supply relevant information in time. Screening LCA's have been proposed from different sides.