Q: How to build the rationale of the study if there is no research gap?

Detailed Question -

I have seen that its important to do a literature search to find the research gap (what has not been done). So, how I will build the rationale of my study if I find so many previous studies that have already been done?

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1 Answer to this question
Answer:

Put emphasis on the fact that your replicating previous studies which is important for your research area.

You are adding to the body of evidence and you could comment on why you think this is important.