The research design is the strategy or blueprint for the collection, measurement, and analysis of your data.
And, although the defense is a challenging prospect, remember it is your chance to share your work with interested colleagues, who will give you valuable feedback.
This is often used as the foundation for the first three chapters of the completed dissertation.
Be sure to read other successful proposals as examples to guide your work.
The work you do may become the starting place for future research work and the next step in your career.
Choose a topic that interests you and will help you advance your career.