Research Gap
Research gap is the gap in the knowledge in a field of study. Research is an investigation; a quest to find something; prove or disprove a hypothesis; what the researcher studies to establish facts is the research gap; what a researcher research about is the research gap.
A PhD thesis or dissertation writing services is an inquiry of a knowledge gap in each field of study that usually adds value to the field. So, it can be said that finding the research gap to research about is the first step in writing a research paper.
