Another consideration. Should the business plan be a document that is focused on selling an idea for a product or service? For many years I worked in a company that did not want anything in a business plan that could be construed as showing a bias towards or against a project. The mantra was to only present facts in the business plan. The Operations Research Department was there to review the analysis as being unbiased. To handle the "what if" scenarios or sensitivity analysis we prepared a supplemental analysis documents which were mostly financial oriented. Personally, I like a factual approach and use the presentation of the final document to point out the conservative aspects of the content.
Business Plan Duration: While writing a business plan you should keep that in mind, how long your business plan can survive? For that you have to do market research about the business you are going to start, it pros and cons. The success of your business can tell you how long your strategy will work? Flexibility: Your business plan must be flexible, if things doesn't workout according to the plan than what will be your next step? Most of the people got stuck in the situation where they don't have enough flexibility in there business plan. So your business plan must be flexible enough so that you can make changes according to the twist and turn in the market.