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How best to represent business model knowledge is an open research issue. A number of approaches for graphically representing business models have been proposed. These are said to facilitate, for example, the understanding, analysis and innovation of a business model. Nonetheless, through the selective literature review we perform, we find these approaches are largely neglected in case study research on business models. We argue that this practice needs to change to make case study research on business models more consistent and comparable, and thereby strengthen the cumulative character of business model research altogether.