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Posted from method123.com
Estimate in Phases
One of the most difficult aspects of planning projects is the estimating process. It can be hard to know exactly what work will be needed in the distant future. It can be difficult to define and estimate work that will be done three months from now. It’s harder to estimate six months in the future. Nine months is even harder. There is more and more estimating uncertainty associated with work that is farther and farther out in the future.
A good approach for larger projects is to break the work into a series of smaller projects, each of which can be planned, estimated and managed separately with a much higher likelihood of success. From an estimating perspective, the closest project can be estimated more precisely, with the subsequent projects estimated with a higher level of uncertainty. When one project completes, the next project can be estimated with a higher degree of confidence, with estimates refined for the remaining projects. This technique also provides checkpoints at the end of each project so that the entire initiative can be revalidated based on current estimates to ensure that it is still viable and worth continuing.
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