Literature review and originality Everyday there are hundreds of papers published worldwide in every single area of study. I am mostly interested in architecture and environmental psychology. 

A question arises how to assure that we select relevant literature review? or how to assure the originality of research? 

For example more recently I am conducting a research on primary school children's perception of an ideal school. I am analyzing children's' drawing. Even my primary analysis reveals statistically significant differences between girls and boys. There are some studies conducted on gender differences similarly. 

So how to assure the originality of the research when there many papers written in this area and despite reading over 100 papers there might be those that we are not aware of?
It all accounts to got much effort you believe you put in to your work. 

Doing a good review isn't at all easy. It involves a whole lot of work to


collect relevant studies
collate them to groups
assess originality
connect the dots
produce illustration
coherently present the information


If that isn't enough, getting permission from authors and publishers to reuse relevant figures is another hassle. To add on, it would be an ordeal to manage 100+ references without a reference management system like LaTeX/BibTeX. 

The point is that as you go through this process, you'll notice that your skill would gradually improve over time. I'm actually  going through this process at the time of writing this post. I came across a couple of double publication, extensively overlapped concepts, and inconclusive studies. These sort of items are the ones I filter out. 

Hope this helps.