The most important part of any dissertation is the introduction. This is where you introduce the research topic and rational for the project.
No dissertation is complete without a literature review. This review should cover any pertinent literature or research studies on the topic.
Anyone who reads your dissertation will want to know how you did your research. You have already done the work for this section; simply tell that reader what you have done.
Your entire dissertation focuses around this section of your paper. Be explicit in describing what you have found. A key part of this section will be discussing your findings. This is your opportunity to tell the reader what you think about your findings.
This section of your dissertation serves as a wrap-up as well as a look to the future. Explain what you recommend for future researchers or practitioners on the subject.