Srujan Your paper is good, but it lacked organization. The logical organization is not proper.
The paragraph breaks are not logical.
Use headings so that the reader can know before hand what you are going to talk about.
You have explained about the "Heavy Weight methodology" but did not explain about "light weight".
Use tables to show the difference and contrast.
After the difference you started explaining "Extreme Programming". I did not understand the conncetivity between them.Try explaining more about them and the connectivity between them.