TOPIC :- COST ESTIMATION
The main body of the paper should be numbered in consecutive order:
III. RESULTS AND DISCUSSION
Here is an example of a Literature Review research paper:
Denicol, J., Davies, A., & Krystallis, I. (2020). What Are the Causes and Cures of Poor Megaproject Performance? A Systematic Literature Review and Research Agenda. Project Management Journal, 51(3), 328345.
You can use this example as a reference to know how to design and write your final paper.
Other useful sources to help in designing your methodology: