Dissertation - research phase
Once you have satisfied the formal prerequisites and have been accepted on to a doctoral programme, you can start work on your dissertation. The dissertation is the core of your doctoral degree and the most important piece of work you will produce for this degree. It is usually written as a monograph which is a comprehensive, self-contained treatment of a research topic.
The main focus of the dissertation is agreed with the supervisor. But of course the candidate is responsible for planning and carrying out the doctoral project.