According to usual practice, you'll likely be assigned a supervisor from your subject area, who'll guide you throughout the dissertation writing process.
Producing a coherent dissertation proposal helps you to communicate with your supervisor the aims and objectives for your research, and the methods you intend to use in making an assessment of your topic.
Writing an effective dissertation proposal is a necessary first step in deciding upon a subject area, focusing in on a research question, and identifying the methods that you will use in collecting and presenting your data.
Whether you're writing an undergraduate or postgraduate proposal, it's vital you check your course and institution requirements prior to submission, since the word count and format can vary between universities.
Either way, make certain to hold regular meetings with your supervisor, to adhere carefully to your university’s regulations and to list the sources that you come across as you do your research, to make sure that they are ready to be included in your bibliography at the end of your work.
It may be that the easiest way to begin to hone in on a specific topic is to go back through all of the lecture slides, notes and assignments that you have completed so far.
Was there a topic that you were particularly interested in?
Was there a concept that you thought could have been developed further?
The first step in creating your dissertation proposal should be planning its structure.
Like the dissertation itself, your proposal will require an introduction, a main section and a conclusion.