Estimation should be done very visibly, with the active involvement of the people who will actually be executing the work. The person responsible for delivering an activity must commit to the work and cost estimates. These people know at the working level what it takes to get the job done, what their work environment is like, what tools and other supporting resources are needed, and how that will all affect the work time and costs to get the job done. Estimating work for each item in the project's work breakdown structure helps ensure the schedule develops methodically based on the hours or work truly required, rather than through top-down guesses about activity durations.
Here are some key pointers for the estimating process. See our guideline Planning and Scheduling: Estimating Work and Costs for more detail on each and guidance for all your schedule estimation work.
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