What’s much harder is to differentiate between the ideas of ‘effort’ and ‘duration’ (most people actually don’t know the difference, so it’s important to explain the definition of what we’re asking them to provide).Įffort is the amount of work that has to be performed to complete the task (regardless of who performs the task, how many people perform the task, and what unrelated other tasks the performers may also have to work on). So why are we so bad at estimating project effort? Most people can say (approximately) how long a task will take them to perform. Vague estimates directly impact the bottom line, but they also affect your reputation. In most services firms, incorrectly estimated work has a costly and negative impact. Where there are no specialists (pre-sales estimators, for example), projects can be off course even before being sold. Most people have limited skills in this area: they’re trained to perform some kind of specialist work like software development or report writing, while estimating is typically left to specialists. Almost anyone who works in an industry that sells services will sooner or later be asked to create an estimate.
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