The paper by Tim Weinert, Matthias Billert, Marian Thiel de Gafenco, Andreas Janson and Jan Marco Leimeister has been accepted in the"Journal of Computer Supported Cooperative Work". It will soon appear in the Special Issue on "Cooperation on the Shopfloor: CSCW in Manufacturing and Industry Settings". The paper is available at the following link and was developed in the KoLeArn project.