Abstract. One of the most significant paradigm shifts of software business management is that individual organizations no longer compete as single entities but as complex dynamic supply networks of interrelated participants. Understanding these intricate software supply networks is a difficult task for decision makers. This paper outlines a modelling technique for representing and reasoning about software supply networks. Modelling software supply networks allows managers to visualize liability and responsibilities and identify new business opportunities in a software supply network. 1 Software Supply Networks Individual businesses no longer compete as single entities but as supply chains [5]. This holds for the software industry as well, where software products and services are no longer monolithical systems developed in-house, but consist of complex hardware and software system federations [3] produced and sold by different organizations. This development has lead organizations to ...