Since projections are not budgets and are much more "big picture" exercises, it is important to use a scenario driven approach to them. I generally like three scenarios; best case, base case, and worst case. But you could do as many scenarios as you like. It's not the results that matter so much, it's the process and the learning that comes from the projections exercise.
(Full Post: http://www.avc.com/a_vc/2010/05/scenarios.html)
Fred Wilson has been a venture capitalist since 1987. He currently is a managing partner at Union Square Ventures and also founded Flatiron Partners. Fred has a Bachelors degree in Mechanical Engineering from MIT and an MBA from The Wharton School of Business at the University of Pennsylvania. Fred is married with three kids and lives in New York City.