The overall objective of this research project is the development and evaluation of a flexible and cooperative management system within SME based production networks for the ramp-up process. Inter-organizational processes of six previous ramp ups were analyzed and documented in flow charts. Highlevel executives and domain-experts of the production nets developed in moderated focus-groups standardized steps and phases of the ramp-up processes and agreed on one common reference workflow. The reference workflow is the basis for the further development of the inter-organizational management of virtual project teams supported by an IT-assisted workflow management system.