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The project manager will request estimates on each task from all the resources assigned to the task. It's important to ask all members since variation and expertise among the team might result in significantly different estimates for the time and effort involved.
When estimating effort, each team member should determine how long it will take for the work required to complete his or her assigned tasks or activities. Estimate are generally provided in hours, and team members should be allowed to cooperate and ask for a consultation when they're creating the estimates.
Team members with less experience will often need more time and effort than those with greater experience, and might also need more assistance coming up with accurate estimates. The project manager should assist with the estimation of effort by compiling information from past projects that contain similar work.
Time estimates are the duration of the actual time it would take to complete a task. Time estimates are impacted by the availability of a resource, dependencies, and the amount of effort expected to complete the task.
EXAMPLE
If the effort estimate on a task is 8 hours, but the resource is only available for 50% of the day, the time estimate will be two days since work can only be done for 4 hours per day. If the dependency leading into the task has a lag time of one day, then the total time to complete the task would increase to three days.Remember that it's the project manager's role to teach people about the impacts, of factors such as resource availability and dependencies, and to document them clearly so everyone understands how the workflow will proceed.
One method used to estimate time or effort on a task is the average estimate. In this method, the project manager asks a team member to give two estimates:
EXAMPLE
The project manager asked a team member to estimate the effort needed to program a quiz onto a web page.Source: this work is adapted from Sophia author jeff carroll.