System of Systems: “Defining the system of interest”

This paper proposes a multi-dimensional framework approach to defining the System of Interest (SOI) for System of Systems (SoS). A number of dimensions are described in detail, enabling development of a more comprehensive model that illustrates the relationships between these dimensions in SoS. The resultant framework model is evaluated using 2 practical case studies in the domains of Defence and ICT to indicate the applicability and suitability of the proposed approach. The potential benefits of the framework are described within the context of the case studies, in conjunction with the limitations of this initial framework. A brief description of intended further research is provided giving some insight into future development of the framework.