An iterative process is one that you do over and over again. Some tasks or activities in a project (testing, for example) will require you to do something many times or even in a cycle. In order for your WBS to accurately reflect task durations and cost estimates—the basic goals of deliverable decomposition and WBS construction—you'll need to understand elements that require iteration and address them accordingly.
Note For some people, iteration doesn't just mean "do often;" it also includes a meaning of decision loop or cycle. But any time you must perform the same action more than once, good project management includes analyzing whether this is time- and quality-efficient. So here, iteration captures all repetition.
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