Formal Proposal is usually respond to Request for Proposal (RFPs) from external source These RFPs is normally have specific guidelines and format for your proposal. While in informal proposal is written as memos since it is a formal report within the organization or company.
The structure for informal proposal is much simple than informal proposal. Informal proposal compose of purpose of your proposal and problem statement as well as background and scope. Scope is written to know the limitations of your proposal. Also, include the planned approach in order to solve the problem and how it will be implemented. Other components include personnel, facilities and equipment, budget and project timeline. At the last part, you can write a conclusion which provides a summary of the entire proposal with the information of your contact details
Writing formal proposal is more difficult than informal proposal since the components if more complicated. In addition, external source will be given a format to be followed. These components include cover letter, introduction, purpose of the proposal, methodology, project timetable, required facilities and equipment, resume, bibliography and appendices. Also you should include summary, table of contents and list of figures and tables.
Proposal is written to solve whether it is formal or informal proposal. Examples of problems are outdated system, low volume of sales, slow processing of information, poor service, and many more. These problems can be solved using methods that can be elaborate in your proposal through feasibility study and business plan.