This report is a further development of the report "Evaluation of two streamlined life cycle assessment methods" (Hochschorner et al, 2002). The report briefly describes the process of LCA and different ways to simplify it. The following two problems with the evaluation of streamlined life cycle assessment are discussed within this report. How two different ways of streamlining LCA can be compared. If the result from a traditional LCA should be considered as the true result to a streamlined life cycle assessment.