The idea behind a proposal essay is that the author is attempting to convince the reader that a product or set of ideas is the best way to achieve the given ends. For example, you might compose a proposal essay that will try to convince your reader that a certain type of printer is the best for your given office set up. The more organized a proposal essay is, the better off it will be for you. Usually a proposal essay will analyze the need for the proposal in the first place, as well as suggest a solution that will be backed up by data and logical writing.