The rule applies at all levels within the hierarchy: the sum of the work at the "child" level must equal 100% of the work represented by the "parent" and the WBS should not include any work that falls outside the actual scope of the project, that is, it cannot include more than 100% of the work… It is important to remember that the 100% rule also applies to the activity level.
A aplicación desta regra vale para todos os niveis na xerarquía: a suma de todos o traballo dos niveis "fillos" de ser igual a 100% do traballo representado polo "pai" e a WBS non debe incluír calquera traballo que saia do ámbito existente do proxecto, isto é, el non pode incluír máis do 100% do traballo.