Good proposals stimulate my curiosity. As I read a proposal, I begin to think up new questions about the project and its science. The best proposals answer those questions before I'm done reading. I have a lot of respect for writers who can anticipate the questions that a reader will have and provide answers.
- Alexander Grushow, Rider University (from Write Like a Chemist: A Guide and Resource).
In general, research proposals need to communicate the importance of the work being done as well as persuade the the funding agency (or your dissertation committee) that the work is worthy of funding (or passing). The should be innovative, significant, relevant, and feasible. Ideas should be intellectually sound. Typically reviewers (and committee members!) judge the intellectual merit of your proposal according to the creativity of ideas, the credibility of your your research plan, and your competence as a researcher.
Again, in general proposals should include the following sections (always pay attention to the parts of the proposal outlined by the funding agency you are submitting to).
Useful links that provide guidance about writing research proposals.