One common reason for applying LCA to waste management systems is to compare alternative solutions for waste manage¬ment. We wanted to analyse the robustness of scenario compari¬son to uncertainty in the waste composition. We used the waste composition in the five cities included in the study, with the same disaggregation factors used for the reference scenario. In five alter¬native scenarios we first applied an increase in source separation of paper and cardboard from 75% to 90%, secondly an increase of plas¬tic source separation from 25% to 50%, thirdly an increase of metal recycling from 65% to 90%. Fourthly, we introduced food waste sorting and biogas production with a 50% sorting efficiency, and fi¬nally we included all the measures in the first four scenarios to¬gether (Table 3). Since the sorting efficiencies were given, the Case 1 calculation method was used.