4.3 Results of the ISM Approach
Interaction between RE practices and the key knowledge areas is determined using the ISM method. Many academic researchers have used a similar methodology to investigate the contextual interaction of elements [40-43, 47]. ISM method helps in presenting a complex system in a simplified way, provides an interpretation of the embedded object, and transforms unclear and poorly articulated mental models of systems into visible, well-defined models, thereby helping in answering what  and how  in theory, building facilitates the identification of the structure within a system [40-43, 47]. A structural-self-interaction matrix (SSIM), as provided in the following sections, is required to develop the contextual interaction between the criteria.