Dissertations / Headings & Sub Headings (Dissertation) [2]

Hi

Does anyone know how to structure your headings in a dissertation. I have to write an essay that contains a
literature review, intro, body and conclusion and I have to use sub headings.

I'm not sure what sub headings to put.
Should I put a sub heading for the introduction called "INTRODUCTION" and a heading for the conclusion called
"CONCLUSION"? What about the Literature review? How do I place a heading on that? What do I call it?

Thanks.