Read and re-read the thesis guidelines. Capstone and thesis requirements for graduation vary for each school. Ensure that you have read all of the rules for composition style, research requirements, reference section rules, page limits and anything else that applies to your writing.
Meet with your thesis adviser. Student in most universities are assigned a thesis adviser or thesis committee who will meet with you on a weekly or biweekly basis to check on your research and writing progress. Make appointments to meet with the faculty thesis adviser. Take notes in the meeting and apply them when working on new sections and drafts. Create a list of specific research questions, writing concerns and fundamental problems you have run into in writing your argument.
Choose a fascinating argument no one has ever written about before. Do not let this initial part of the thesis frighten you. Instead, it should inspire you to make an original discovery in your field. Start by reading anything and everything you can about your topic. For example, if you decide to write a thesis about tarantulas in Ecuador's Choco rain forest, search for the top entomologists in the world who study tarantulas in Ecuador. Read only recognized sources and avoid relying on the Internet too much.
Narrow the subject to a key argument. An argument is a viewpoint on a subject that you will defend. In the Ecuadorian tarantula example, craft an argument that identifies an intriguing perspective. If you find that tarantulas are mysteriously disappearing from the rain forest and that there has been an increase in a particular kind of carnivorous plant, you can argue that the particular plant species is devouring the majestic hairy tarantula. However, your claim must be factual. A college will require that you have references for every claim you assert.
Write a conclusion that wraps up your research in a compelling, memorable way. Address the "so what?" question in the conclusion -- that is, the purpose of the thesis and what it means to a specific community and to the world. Summarize for readers what they have just learned.
For example, if you are writing about mangroves -- endangered trees and shrubs that grow where freshwater meets saltwater -- you can sum up your capstone or thesis by restating your argument and addressing what impact your argument has on the world today. For instance, you may conclude by writing, "Because shrimp industries established in Ecuador destroy mangrove ecosystems, instead of receiving clean water, nearby farms and urban centers receive dirty water, which mangrove roots naturally filtrate." (See Reference 2).