Contingency Reserve: Cost Baseline Allocation for Known Unknowns

PMBOK v8 Definition

Contingency reserves (sometimes called contingency allowances) are the budget within the cost baseline that is allocated for identified risks. They are intended to address the known-unknowns that can affect a project—for example, anticipated rework for some project deliverables where the amount of rework is unknown. Contingency reserves can be provided at any level from the specific activity to the entire project.

Why It Matters for the Exam

The PMI exam frequently tests your understanding of where contingency reserves sit in the budget structure and how they differ from management reserves. Expect questions that ask you to identify the correct treatment of contingency reserves in cost baseline calculations, funding requirements, and when they can be changed. These appear in both situational and definition-based questions.

Key Points to Remember (for the exam)

• Definition: Budget within the cost baseline allocated for identified risks (known-unknowns)
• Calculation Methods: May be a percentage of estimated cost, a fixed number, or developed by using quantitative analysis methods
• Dynamic Nature: As more precise information becomes available, the contingency reserve may be used, reduced, or eliminated
• Documentation: Contingency should be clearly identified in the cost documentation
• Baseline Status: Contingency reserves are part of the cost baseline AND the overall funding requirements for the project
• Change Control: The cost baseline (including contingency) can be changed only through formal change control procedures
• Key Distinction: Contingency reserves are NOT management reserves—management reserves are outside the cost baseline

Typical PMI Exam Example

Your project team identifies a risk that rework may be needed on three deliverables, but the exact amount of rework cannot be estimated. You include a contingency reserve of 15% of the estimated cost for these activities. During execution, the rework is completed for 10% of the reserve. The remaining 5% is reduced from the contingency reserve. This is an example of using and reducing contingency reserves as more precise information becomes available.

PMI Exam Traps

• Trap: Confusing contingency reserves with management reserves

  • Reality: Contingency reserves are within the cost baseline for identified risks; management reserves are outside the cost baseline for unknown-unknowns

• Trap: Thinking contingency reserves can only be a percentage

  • Reality: Contingency reserves may be a percentage, a fixed number, or developed using quantitative analysis methods

• Trap: Assuming contingency reserves are fixed once set

  • Reality: As more precise information becomes available, contingency reserves may be used, reduced, or eliminated

• Trap: Believing contingency reserves are optional in cost estimates

  • Reality: Cost estimates may include contingency reserves, and when included, they are part of the cost baseline

Important PMI Connections

Quick Review Questions

1. Are contingency reserves part of the cost baseline or management reserves?

2. What three methods can be used to determine the amount of contingency reserve?

3. What happens to contingency reserves as more precise information becomes available?

4. How do contingency reserves differ from management reserves in terms of what risks they address?

5. Can contingency reserves be provided at the activity level, or only at the project level?

PMBOK v8 Reference

Section 2.7.3 - Cost Baseline and Project Budget (including Figure 2-25: Two Scenarios of Budget Buildup)
Section 7.2.2.5 - Reserve Analysis