Increasing adoption of Open Source Software (OSS) in information system engineering has led to the emergence of different OSS business strate-gies that affect and shape organizations’ business models. In order to obtain the specific organizational model for a concrete organization that is adhering to a specific OSS business strategy, we need to instantiate the general knowledge included in this business strategy. This paper describe the process in which this general knowledge is instantiated and define a set of operations over i* models to implement the instantiation concept. Although conceived in the field of OSS, the approach is generalizable to any kind of business strategy.