All too often when working with clients, I hear the question asked, “What’s the size of the market?” That’s a question that analyst firms love to hear because they can sell the answer to whomever is asking the question. However, proper market sizing goes much deeper than what a typical analyst firm can answer, and is much more about relative size than precision. A project team that I was working with a while back gave a presentation to their Executive VP about investing in a new opportunity. The company was not currently in this particular market and the team was asking for investment dollars to go after a market that they estimated to be between $5 billion and $6 billion. The executive asked the team “Well, which is it?” The bewildered team asked, “Which is what?” The executive replied, “Is it $5 billion or $6 billion?” The team replied, “We don’t know precisely, but we are confident that it is in that range.” At which time the executive sent the team away to do more research because, as she said: “If you don’t know the market better than that, we shouldn't be investing.”