Write your business plan in sessions. Don't think that you have to produce a business plan before go to bed tonight or you won't be able to open your doors for business tomorrow. I like Tim Berry's Plan-As-You-Go method of business planning. The practice of planning is an effective way to really get to know your business and you might end up discovering some important things about your company and about yourself.
Strategic plan: Asses the impact of the business environment (STEER analysis: Socio-cultural, Technological, Economic, Ecological, and Regulatory factors). Includes company vision, mission, goals and objectives, in order to plan three to five years into the future.
Of course, you will need a plan of strategies in order to accomplish each objective, but those details will be expounded upon in your annual work plan. A list of three short-term and three long-term goals, along with the objectives necessary to achieve them, is sufficient for most business plans. Remember to replace the goals and objectives with new ones as you check them off your list.
Marketing plan: Includes analysis of your target market (your customers), as well as the competition within that market, and your marketing strategy. This plan is usually part of the strategic plan.
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