Which of the following tools or techniques is used for Estimate Activity Duration?

Question

Options

• ACritical path
• BRolling Wave
• CPDM
• DParametric

• A
  13% (8)
• B
  3% (2)
• C
  8% (5)
• D
  76% (48)

Explanation

Parametric estimating uses statistical relationships between historical data and project variables (e.g., hours per unit, cost per square foot) to mathematically calculate activity durations, making it a direct tool for the Estimate Activity Duration process in PMBOK.

Why the distractors are wrong:

• A. Critical Path belongs to the Develop Schedule process - it identifies the longest sequence of activities but says nothing about how long individual activities take.
• B. Rolling Wave Planning is a progressive elaboration technique used in Define Activities, where near-term work is planned in detail while future work stays at a high level.
• C. PDM (Precedence Diagramming Method) is used in Sequence Activities to map logical relationships (FS, SS, FF, SF) between activities - it's about order, not duration.

Memory tip: Think "Parameters measure duration" - Parametric = plugging known rates or quantities into a formula to measure how long something takes. The other three tools deal with scheduling, sequencing, or defining work - all after you've already estimated.

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