It is important because it shows what previous researchers
have discovered. It is usually quite long and primarily depends upon how much research
has previously been done in the area researcher is planning to investigate. If the researcher
is planning to explore a relatively new area, the literature review should cite similar
areas of study or studies that lead up to the current research. Never say that the area is
so new that no research exists. It is one of the key elements that readers look at when
reading the research papers and approving them for publication.