The cost and workload pressure on enterprises increases gradually in the context of globalisation. These new obstacles have to be surmounted with selected sourcing strategies. As added-value depths of about 60% had still been real during the 90s, the current average peak has decreased to 43%. This gap in the internally generated added-value is being closed by procurement of purchased parts and bought-in components. For cost reasons, the suppliers are subject to a broad geographic distribution. The consequence is that SMEs are particularly vulnerable to production losses. Hence an accurate knowledge of those risks and their consequences is of special significance.