Time and cost estimates should be done in a "progressive elaboration" process, meaning they start out general and less accurate and over time become more detailed and accurate as the project proceeds.

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Progressive elaboration is a common technique used in project management where planning and estimating are done in stages, starting with broad outlines and becoming more detailed and accurate as the project progresses. This approach allows for more flexibility and adaptation to changes in the project scope and requirements.

Time and Cost Estimates Should Be Done in a "Progressive