A Swedish-Norwegian project for the follow-up and evaluation of large-scale systems for composting and digestion of source separated biological waste was carried out during 2002-2004, financed by The Swedish Association of Waste Management (RVF) together with several other Swedish and Norwegian organisations. The project was entitled BUS (Biological waste treatment - evaluation of systems).BUS consisted of 10 individual projects carried out by different project leaders. Each of the projects has been presented in a report, published in Swedish in the form of a RVF report, Swedish Environmental Protection Agency (NV) report and/or a STEM report. The last individual project consisted of a synthesis of the whole BUS, with the objective to make a collation of the other individual projects within BUS thus providing an overall summary of the projects and presentation of general conclusions. Synthesis is here taken to mean a focus on information and conclusions that cannot be drawn from the individual projects, but that instead have to be based on the results of a combination of several projects.This report contains an English translation of the BUS-synthesis, prepared for The Nordic Council of Ministers' group on organic waste, within the working group on Products and Waste (The PA-group), with the objective to make the conclusions from BUS available to a broader target group.