It’s possible to estimate an agile project’s user stories or features in the same way. When I’m at an unfamiliar restaurant and order a large soda, I don’t really know how many ounces I’ll get. About all I do know is that a large soda is larger than a small or medium soda and that it’s smaller than an extra-large one. I also know from experience that when I’m about as thirsty as I am now, a large soda at other restaurants has been the right size. Fortunately, this is all the knowledge I need. And on software projects it’s even easier: All I need to know is whether a particular story or feature
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