Researchers review the literature to document what is known about a topic and to uncover reports is not known. Researchers use the literature in their reports to share this knowledge with the to readers and to demonstrate that they are sufficiently aware of other research on summarize and report this knowledge as part of the statement of the problem or in a stand-alone section As discussed in Chapter 3, they also clearly state the knowledge that is missing in the available literature to convey the importance of the study with statements such as little is known about or" there is a gap.