Business proposals contain both a mission statement and a purpose statement. The mission statement explains what you what your company can achieve to a future client. The purpose statement explains why you have written the business plan, why you are a great choice and how you can help their business operations. Whatever the project is a well written business document supports what you are trying to say about your business. Thus, when you give a great business document, you clarify for yourself the direction you want to take with your business!