VII. DISCUSSION
During this research, it has come to light that the in-depth study of the attained literature, the classifying among the eight different sub-domains and drafting the requirements framework took more effort than anticipated. The fact that papers often discuss multiple sub-domains with its own unique interconnections based on the purpose of the paper, implied that the papers had to be studied in greater detail to gain more insights into used terms, terminology and overlapping subdomains besides differences in language and writing styles. Furthermore, generalizing the findings of the field study also required more in-depth insights into the identified challenges.
As indicated in Section V, it was adverse differentiating the eight sub-domains based on their primary addressed topic in the papers. A variety of papers discuss multiple subdomains in some degree. So, every paper discussing multiple interconnected sub-domains with paper thin boundaries has been discussed in the different sub-domains. Observed in the papers is the absence of thorough research into the sub-domains of Business Opportunities and Environmental Sustainability. One reason of this could be that these sub-domains are less interesting to study, since Smart Cities attract lots of attention towards the technical aspects besides the straightforward business opportunities and implications of technologies on environmental sustainability. Yet, due to the exclusion criteria narrowing down the scope of searching for literature within the field of computer science, it could be that these sub-domains may be a topic of study in other fields of expertise.
