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.

A version of this article appeared in the July–August 1997 issue of Harvard Business Review.