To define a target market for your business plan, you should research the potential buying audience for your product. This could range from millions of people if you are starting an online business, to a few thousand individuals if you are opening a retail store in a small town.
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Once you have defined the target market:
Base your future projections on research and details from your findings. Make projections based on past buying habits, the average purchase amount, and other factors, such as your ability to make the products or services available. The more you know about this target market, the more confidence you will have in your sales projections.
The same need to identify your target audience (business-to-consumer market) will also hold true if you are serving a business market (business-to-business market). You need to determine which companies will benefit from your products or services. Will you meet the needs of a specific industry or several industries? Large or small businesses? Public or privately owned businesses? Define exactly the types of businesses that will buy your product or services and target them through your marketing efforts.
Another way to look at target market is to consider how you are positioning your company and your products. Read "What's Your Position in the Market?" to get the basics of this important but tricky concept.
You can also get a computer assist in creating and refining your business plan; read the AllBusiness.com Buyer's Guide to Tools that Can Help You Write Your Business Plan.