Your literature review should be completed as part of the proposal process. Provide any updates based upon continuing work. Begin adjusting verb tense from the future tense of the proposal to the past tense for the completed dissertation.

Summary
As part of clear writing, the judicious use of summary paragraphs is helpful. Even the best-written literature reviews and research can lose connection or flow with the reader. Periodic summary statements that clarify the key points or findings of a section can help keep the reader informed and engaged.