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Question:

A project manager discusses with the project team to estimate the duration of activities identified to date. The project sponsor recently instructed the project manager to present her with a duration estimate for the project that includes a high confidence level. What estimating technique is the project manager likely to practice, assuming that the necessary information is available?  

A Bottom-up estimating 
Explaination

Bottom-up estimating is carried out by obtaining individual estimates for each project activity and then adding all of them up together to activity and then adding all of them up together to come up with a total estimate for the work package or the project. It is generally an accurate means of estimating, although it’s more time-consuming and costly to perform.