A research proposal is the most important document that you will write to get accepted for the research degree in a university. These 1500-2000 words establish your interest and convince the research advisor that you are dedicated and competent to carry out the research.
You should effectively be able to ascertain that not only is the research worth doing but also establish the fact that it is RESEARCHABLE. Most universities weigh the options that they come across according to the resources available and the result that would come out of the research and whether or not the resources spent is directly proportionate to the interest the result would generate.
To do so the student will have to outline the topic effectively and also clearly so that the research advisor can see your point of view and get the required information to get interested. Your proposal will be seen by several prospective supervisors who have expertise in the chosen field and you will need to convince them that your proposal offers exciting research possibilities and that you have the ability to research it.