“…Elements of IS design theories -(user) requirements, models, and methods -combined with the research approach applied offer a rigorous framework for structuring the literature (Mayer, Steinecke, and Quick 2011). Figure 1 illustrates the following research gaps: Sound requirements analysis is missing (Figure 1, first column left): Most of the publications, for example Frolick, Parzinger, Rainer Jr., and Ramarapu (1997) (Chen, Chau, and Li 2011) or scenarios based on opportunity and threat analysis are not specified (Fontela 1976). Since research approaches (Figure 1) are not the focus of this article, gaps in this dimension are not specified here.…”