A literature review is considered to be a research methodology in its own right when it is carried out systematically. In other words, if a literature review):

• Is commenced with a well-defined research question,
• Follows a systematic approach to answering that question,
• Clearly documents the steps that are taken to write up,
• Presents the results and discussion section, it can be taken as a research methodology as well.

Deepening the knowledge related to the research topic is only a purpose of literature review in a study.