I go more in-depth into the proposal writing process in my article How to Write a Proposal that Clients Can’t Say No To. But, for now, writing a proposal will include the following key parts:
1. Introduction,
2. Project Summary
3. Project Details
4. Conclusion
5. Any references cited
The introduction will primarily be a statement of the problem and a suggested solution or thesis. The Project Summary will be a short, concise elevator-pitch of your proposed solution. The Project Details will breakdown HOW you are going to achieve the aforementioned solution and typically includes items like timeline, costs, resources needed, deliverables, and risk assessment. Finally, the Conclusion summarizes all of the above. If you have cited any academic or professional sources, you can also include a References section.