How to Write a Great Business Plan

Every seasoned investor knows that detailed financial projections for a new company are an act of imagination. Nevertheless, most business plans pour far too much ink on the numbers–and far too little on the information that really matters. Why? William Sahlman suggests that a great business plan is one that focuses on a series of questions. These questions relate to the four factors critical to the success of every new venture: the people, the opportunity, the context, and the possibilities for both risk and reward. The questions about people revolve around three issues: What do they know? Whom do they know? and How well are they known? As for opportunity, the plan should focus on two questions: Is the market for the venture’s product or service large or rapidly growing (or preferably both)? and Is the industry structurally attractive? Then, in addition to demonstrating an understanding of the context in which their venture will operate, entrepreneurs should make clear how they will respond when that context inevitably changes. Finally, the plan should look unflinchingly at the risks the new venture faces, giving would-be backers a realistic idea of what magnitude of reward they can expect and when they can expect it. A great business plan is not easy to compose, Sahlman acknowledges, largely because most entrepreneurs are wild-eyed optimists. But one that asks the right questions is a powerful tool. A better deal, not to mention a better shot at success, awaits entrepreneurs who use it.

Few areas of business attract as much attention as new ventures, and few aspects of new-venture creation attract as much attention as the business plan. Countless books and articles in the popular press dissect the topic. A growing number of annual business-plan contests are springing up across the United States and, increasingly, in other countries. Both graduate and undergraduate schools devote entire courses to the subject. Indeed, judging by all the hoopla surrounding business plans, you would think that the only things standing between a would-be entrepreneur and spectacular success are glossy five-color charts, a bundle of meticulous-looking spreadsheets, and a decade of month-by-month financial projections.

William A. Sahlman is the Dimitri V. D’Arbeloff-MBA Class of 1955 Professor of Business Administration at the Harvard Business School.