2. Research methodology
The objective of this research is to identify major works on interdisciplinary research in GL and SI, and thereafter, to classify and integrate them so as to discover gaps, critical issues and opportunities for further study and research. The literature review is a valid approach and necessary step in exploring new research directions and forms an integral part of the related research, which also helps to scrutinize the conceptual aspects and guides the research toward new theoretical development (Meredith, 1993 and Seuring and Müller, 2008). The literature review is conducted for content analysis, where quantitative and qualitative aspects are reviewed to assess the context as well as the content (Brewerton and Millward, 2001). The process of this literature review follows the four-step process model proposed by Mayring (2004); material collection, descriptive analysis, category selection, and material evaluation, described in Fig. 1, and the review process is carried out accordingly.