The auditing on the basis of the series of standards SN EN 50625 delivers to the companies, but also the research community important findings for determining the efficiency of the recovery of raw materials and the separation and environmentally sound disposal of pollutants. Since 1994, Empa has been carrying out conformity assessments of the recycling partners of Swico, the Swiss IT and Office Electronics Association. In addition to monitoring legal compliance, the auditing includes annual monitoring of material flows and regular batch tests to determine the efficiency of the recycling processes. The results enable the industry to maintain and continuously improve the state of the art. And the research receives important results and insights in the context of urban mining.