Why do researchers spend so much time and effort reviewing s

Why do researchers spend so much time and effort reviewing scholarly and professional literature when doing a new research project?

Solution

While doing new research projects, researchers use a lot of their time in referring old literatures because they are the sources that gives them guidance and ideas as to how to take next step. They give a lot of confidence and inspiration to complete the project. This is the reason they spend a lot of time with those literature and works.