Which of the following is an estimate based on past projects to predict the current cost and/or duration of the current project?

A current estimate refers to the estimate being developed now for the ongoing project, not one derived from past project data.

Past project cost is raw historical data, not an estimating technique applied to predict future project outcomes.

'Past estimate' is not a recognized estimating technique; it describes a previous guess rather than a methodology using historical project performance.

A top-down estimate (analogous estimating) relies on actual values from previous similar projects as the basis for estimating the current project's cost and/or duration. It is applied early in the project when detailed information is limited, making it a quick but less precise technique that leverages expert judgment and historical records.