100% Rule

Correct Answer: The remaining 10% must be allocated to other deliverables at the same level

According to the WBS 100% Rule, the sum of all work at each level must equal 100% of the work represented by that level's parent element. When a deliverable accounts for 90% of work at its level, the remaining 10% must be allocated to other deliverables at the same level to comply with the 100% Rule. This ensures all work is accounted for at that decomposition level. The other options are incorrect because: - The 10% cannot be considered estimation variance as this violates the 100% Rule - Moving the 10% to lower level components would break the hierarchical structure and violate the Rule - Using the 10% as management reserve would mean only 90% of work is planned, which contradicts the core principle that all work must be included in the WBS

Correct Answer: Each work package must contribute to the parent element, and all task durations must sum up to the total timeline

The 100% Rule in Work Breakdown Structure (WBS) is a fundamental principle that ensures complete project scope coverage. The correct statement accurately represents the internal consistency check because: 1. It emphasizes that each work package must contribute to the parent element - this ensures hierarchical completeness 2. All task durations must sum up to the total timeline - this ensures mathematical consistency Why other options are incorrect: - Adding contingency reserves to the sum violates the basic principle of the 100% rule as it would exceed 100% - Exceeding the total timeline for potential delays contradicts the mathematical consistency requirement - The 80/20 split is incorrect as the 100% Rule requires ALL work to be included, not just 80% with arbitrary overhead allocation The 100% Rule requires that the WBS includes 100% of the work defined by the project scope and captures all deliverables in terms of work to be completed.

Correct Answer: At each decomposition level during WBS development

The 100% Rule validation should be performed at each decomposition level during WBS development. This is the correct approach because: The 100% Rule states that the WBS must account for 100% of the work defined by the project scope, and all deliverables, including both internal and external work, should be included. Checking at each decomposition level ensures that: - No work is missed during the progressive elaboration - Each parent element fully represents the sum of its child elements - The decomposition is complete before moving to the next level - Any errors or omissions can be caught and corrected early The other options are incorrect because: - Waiting until the final completion stage is too late to catch and correct any missing elements - Checking after all deliverables are added to the project management plan misses the opportunity for early correction - Performing the validation during project closure defeats the purpose of the rule, as it should guide the WBS development process itself