6.4 Approaches to estimating
We are now going to discuss key approaches to estimating. However first we are going to explain the terms bottom-up and top-down. Note that these are not specific estimating methods, but describe a way of grouping estimating methods.
6.4.1 Bottom-up
In essence, we break the task for which an estimate is to be produced into component sub-tasks and then break the component sub-tasks into sub-sub-tasks and so on until we get to elements that we think would not take one or two people more than a week to complete. The idea is that you can realistically imagine what can be accomplished in one or two weeks in a way that would not be possible for one or two months. To get an overall estimate of the effort needed for the ...
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