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When you are writing your dissertation you can get affordable help online and through your school. Both offer a variety of tools that help you manage your time and your progress. They even teach you how to structure the paper.
Writing your dissertation is a unique experience and the structure is something that you need to decide upon for yourself. You will need to consult with your advisor to find the best project structure. You will need to read other works completed by other students too in order to get a feel for what works best.
The most conventional structure for your paper is to write the dissertation in a book form made up of multiple chapters. The number of chapters needed is contingent upon the research you are undertaking but the general organization of chapters would look like this: