Since the amendment of the European Waste Framework Directive by the European Union (EU) in the year 2008 and the thereby accompanied changes of the waste management objectives, the importance of the European and Austrian re-use-sector has been rising continuously. Therefore, collaborations of different individuals, organisations or institutions within so called re-use-networks are especially relevant. In the area of Graz co-operations of social-economic enterprises and other institutions already exist as well. However, there is the problem, that the demand for re-use-products exceeds the supply in this region. In order to counteract this situation, co-operation-potentials of social-economic enterprises and commercial waste management companies in the re-use-sector have been investigated within this study. Concretely, this thesis was used to identify the roles, which could be undertaken by commercial waste collectors within regional re-use-networks to contribute to the establishment of the whole re-use-sector. Hence, in the course of the investigation a case study, which encompassed a stakeholder-analysis of "the implementation of a regional re-use-network in the area of Graz that integrates commercial waste management companies", has been conducted. Throughout the study the potential co-operation partners have been analysed. Basically, commercial waste collectors should be integrated into the procurement of re-use-able materials. Thereby, the concrete duties can be various and are dependent on the regional framework conditions. Based on the potential synergies as well as on the chances and risks of the implementation process, the results of the study finally show that the initiation of such a co-operation could be successful in the region of Graz.