Project proposals is actually an idea that you give to a company for financial assessment to complete that project.The proposal exactly says about the plan of implementation of the project, giving information about the project, ways they will manage it and lastly the results that will be delivered from it.Its all how you plan your action and a series of steps to solve that project or a problem.According to me the main things to be included in the proposals are logical presentation of research done or an idea, tell the significance of that idea, show the relationships of that idea to the pas actions, articulate the activities that needs to be done for the completion of that project.At the end I would say that proposals is a way of presenting the idea to the outside world for the acceptance.