TOPIC :-  COST ESTIMATION The main body of the paper should be numbered in c

   
TOPIC :-  COST ESTIMATION
The main body of the paper should be numbered in consecutive order:
ABSTRACT
I. INTRODUCTION
II. METHOD
III. RESULTS AND DISCUSSION
IV. CONCLUSION
REFERENCES
 
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), 328–345. https://doi.org/10.1177/8756972819896113 (Links to an external site.)
https://journals.sagepub.com/doi/10.1177/8756972819896113 (Links to an external site.)
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:
https://library.sacredheart.edu/c.php?g=29803&p=185933 (Links to an external site.)
https://psychology.ucsd.edu/undergraduate-program/undergraduate-resources/academic-writing-resources/writing-research-papers/research-paper-structure.html#Discussion