Express uncertainty in either the functionality or the date. No plan is certain. Be sure to include an expression of uncertainty in any release plan you produce. If the amount of new functionality is fixed, state your uncertainty as a date range (“We’ll finish in the third quarter” or “We’ll finish in between seven and ten iterations”). If the date is fixed instead, express uncertainty about the exact functionality to be delivered (“We’ll be done on December 31, and the product will include at least these new features, but probably no more than those other new features”). Use bigger units
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