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With cloud computing becoming more than a buzz word and other modern IT service solutions catching on in enterprise environments, decision support models lag behind. Modern IT service landscapes with their loosely coupled services, short-term contracting and on-demand service provisioning have added an additional layer of complexity in service sourcing decision processes and thus require a new form of risk management and decision support for service sourcing. The necessity to determine the right service and provider combination for any given situation in a timely fashion has become even more eminent. The contribution of this research is a decision model for service sourcing that integrates risk and cost information of innovative software services into the decision rationale.