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Project Management & Agile · Foundational

Three-Point Estimating

Technique that uses optimistic, most likely, and pessimistic estimates to account for uncertainty.

Definition

Triangular distribution: E = (O + M + P) / 3. Beta (PERT) distribution: E = (O + 4M + P) / 6. Using ranges improves accuracy and supports risk analysis.

Example

O=4, M=6, P=14 days: triangular 8.0, beta 7.0.

Exam tip

Read carefully whether the question wants triangular or beta (PERT).

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