Rolling wave approach to project management

How often have you been asked for estimates of the duration and the cost of a project and have given answers before you really fully understood the scope of the effort? How often have you been correct? Although you were assured that these estimates were only to be ballpark figures, how often were they set in concrete, never to change? This month’s column discusses how this scenario develops, why this approach seldom works, and what can be done to structure a more realistic alternative.
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