A good business plan communicates one's ideas to people, communicates his mission, objectives, management approach, responsibilities and demonstrates how one's strategy will increase profitability and performance, identifying his audience without overreacting his aims and objectives of his business plan. A business communicates in two ways- Internal communication and External communication. Internal communication includes communication of corporate vision, shared value, strategies, guiding principles and employee motivation. External communication includes branding, customer relation, marketing, advertising, media and public relations etc..
It's also important to show the business plan to the vendor or bank manager. If your business needs financing at the beginning, then you need to turn to one of these sources for financial assistance. With that in mind, you need to produce a detailed business plan that shows that your business is credible and also has potential for making money. Not only does the plan prove that you are serious about the business, it also shows that you have a sound business mind and a good grasp of what needs to be done in order to achieve good profits.