The business plan admits the entrepreneur to the investment process. Without a plan furnished in advance, many investor groups won’t even grant an interview. And the plan must be outstanding if it is to win investment funds.

Too many entrepreneurs, though, continue to believe that if they build a better mousetrap, the world will beat a path to their door. A good mousetrap is important, but it’s only part of meeting the challenge. Also important is satisfying the needs of marketers and investors. Marketers want to see evidence of customer interest and a viable market. Investors want to know when they can cash out and how good the financial projections are. Drawing on their own experiences and those of the Massachusetts Institute of Technology Enterprise Forum, the authors show entrepreneurs how to write convincing and winning business plans.

A comprehensive, carefully thought-out business plan is essential to the success of entrepreneurs and corporate managers. Whether you are starting up a new business, seeking additional capital for existing product lines, or proposing a new activity in a corporate division, you will never face a more challenging writing assignment than the preparation of a business plan.

Only a well-conceived and well-packaged plan can win the necessary investment and support for your idea. It must describe the company or proposed project accurately and attractively. Even though its subject is a moving target, the plan must detail the company’s or the project’s present status, current needs, and expected future. You must present and justify ongoing and changing resource requirements, marketing decisions, financial projections, production demands, and personnel needs in logical and convincing fashion.

Because they struggle so hard to assemble, organize, describe, and document so much, it is not surprising that managers sometimes overlook the fundamentals. We have found that the most important one is the accurate reflection of the viewpoints of three constituencies.

1. The market, including both existing and prospective clients, customers, and users of the planned product or service.

2. The investors, whether of financial or other resources.

3. The producer, whether the entrepreneur or the inventor.

Too many business plans are written solely from the viewpoint of the third constituency—the producer. They describe the underlying technology or creativity of the proposed product or service in glowing terms and at great length. They neglect the constituencies that give the venture its financial viability—the market and the investor.

Take the case of five executives seeking financing to establish their own engineering consulting firm. In their business plan, they listed a dozen types of specialized engineering services and estimated their annual sales and profit growth at 20%. But the executives did not determine which of the proposed dozen services their potential clients really needed and which would be most profitable. By neglecting to examine these issues closely, they ignored the possibility that the marketplace might want some services not among the dozen listed.

Moreover, they failed to indicate the price of new shares or the percentage available to investors. Dealing with the investor’s perspective was important because—for a new venture, at least—backers seek a return of 40% to 60% on their capital, compounded annually. The expected sales and profit growth rates of 20% could not provide the necessary return unless the founders gave up a substantial share of the company.