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Streamlining Life Cycle Inventory Analysis is an indispensable condition to make Life Cycle Assessment cost effective and therefore applicable to a wide spectrum of users. This paper presents a Hybrid-Approach which completes the generally used Process Chain Analysis by a model based on economic Input-Output-Tables and data on sector specific elementary flows. The additional use of Input-Output-Analysis allows a quick and easy estimation of the elementary flows of processes not included in the process chain and therefore serves to check whether the existing process chain has a satisfactory degree of accuracy or should be more detailed.