[header] How to write a good thesis [title] Confirm that your idea fits the assignment. [step] Read the assignment prompt from your professor or whatever instructions you have for your writing project. Make sure you clearly understand the requirements of the assignment and what the expected outcome is. 
This will give you clues as to what kind of research you should do, what kind of question your thesis should answer, and what the paper should accomplish. [substeps] If you aren't sure if your idea fits the assignment, ask the teacher.