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PK0-005 Practice Question: A project has a mandatory dependency between two…
A project has a mandatory dependency between two activities: the foundation must be poured before the walls can be erected. This dependency is based on the physical nature of the work and cannot be changed. What type of dependency is this?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mandatory dependency
Mandatory dependencies, also known as hard logic, are inherent in the nature of the work and cannot be altered. Discretionary dependencies are best practices but can be changed. External dependencies involve factors outside the project. Resource constraints relate to limited availability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Discretionary dependency
Why it's wrong here
Discretionary dependencies reflect a preferred sequence chosen by the team, often based on best practice, and can be reordered if needed. It is tempting because teams often sequence work by choice, but this stem states the order is fixed by physical construction logic and cannot be changed, making it mandatory.
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External dependency
Why it's wrong here
External dependencies link project activities to parties outside the project team, such as suppliers, regulators or vendors. It is tempting because external bodies can impose sequencing, but the foundation-before-walls order stems from the physical nature of the work itself, not from any external party's requirements or approvals.
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Mandatory dependency
Why this is correct
A mandatory dependency is one required by the nature of the work itself, such as concrete curing before walls rise. It is inherent to the physical or contractual logic and cannot be altered by the project team.
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Resource constraint
Why it's wrong here
Resource constraints arise from limited availability of people, equipment or budget, not from the physical sequence of construction work. It is tempting because constrained resources can create scheduling dependencies, but here the foundation-to-walls order is fixed by physics, making it a mandatory dependency regardless of resource levels.
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