Bottom Up Estimating technique is a method of estimating the duration of each work package in the Work Breakdown Structure.
In using the Bottom Up estimation, the estimate are then rolled up or aggregated for progressively higher levels within the Work Breakdown Structure.
The Project Manager reviews estimate features and add the required overhead estimate to compile the total project cost.
In Bottom Up Estimating, you are calculating the cost of your project from the ground up in order to know the total cost of your project. This is normally used for Project that you are well versed in how it is been done.
Bottom Up Estimating is the most accurate method but it is also challenging , costly and time consuming .
When to use Bottom Up Estimating….
You can use Bottom Up Estimating when more details are available to you about how each of the work packages will be carried out. That means you must know that needed to be done in the project before you can use this method of calculation.
You also use Bottom Up estimating when you need more accurate estimating . In using it, you have to know all the activities that needed to be done before you can apply this method of estimation.
It is also time consuming. You can only use this method of estimation when you have the ample time that you want to devote to estimation.
You should also use Bottom Up estimation for work packages with the highest level of uncertainty associated with cost. Make sure that you weigh the additional accuracy provided by bottom up estimating against the additional cost of making the estimates.
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