Reserve: A Provision in the Project Management Plan to Mitigate Cost and/or Schedule Risk

PMBOK v8 Definition

A reserve is a provision in the project management plan to mitigate cost and/or schedule risk, often used with a modifier (e.g., management reserve, contingency reserve) to provide further detail on what types of risk are meant to be mitigated. Contingency reserves and management reserves are distinct in their purpose and authority of usage and may differ on risk classification (known-unknowns or unknown-unknowns). This concept is defined in the PMBOK v8 glossary and detailed within the Risk Performance Domain (Section 2.7) and Cost Performance Domain.

Why It Matters for the Exam

Reserves appear frequently on the PMI exam because they test your understanding of risk response strategies, budget ownership, and change control authority. Exam questions often assess whether you can distinguish between contingency reserves (for known-unknowns) and management reserves (for unknown-unknowns), as well as which reserves are included in the cost baseline versus the project budget.

Key Points to Remember (for the exam)

• Definition: A reserve is a provision in the project management plan to mitigate cost and/or schedule risk, always used with a modifier (contingency or management).

• Contingency Reserve: Time or money allocated in the schedule or cost baseline for known risks with active response strategies; addresses known-unknowns; usually allocated in the initial project budget.

• Management Reserve: Time or money not included in the cost baseline; addresses unknown-unknowns; can be changed only through formal change control procedures.

• Cost Baseline Options: The cost baseline may include contingency reserve (left side of Figure 2-25) or exclude contingency reserve (right side of Figure 2-25). Management reserves are always excluded from the cost baseline.

• Authority of Usage: Contingency reserves typically have delegated authority to the project manager; management reserves require formal change control procedures and higher-level approval.

• Risk Classification Link: Contingency reserves = known-unknowns; Management reserves = unknown-unknowns. This distinction is critical for exam questions.

• Location in Budget: Contingency reserve is part of the cost baseline; management reserve is part of the overall project budget but outside the cost baseline.

Typical PMI Exam Example

A project manager is developing the cost baseline for a construction project. The team has identified several potential risks, including possible rework for concrete foundations (estimated at $50,000) and potential delays from supplier delivery issues. The project manager allocates $50,000 for the rework risk. This $50,000 is a contingency reserve because it addresses a known risk with an active response strategy and is included in the cost baseline.

PMI Exam Traps

• Trap: Thinking all reserves are the same and interchangeable.

• Reality: Contingency reserves are for known-unknowns with active response strategies; management reserves are for unknown-unknowns requiring formal change control.

• Trap: Assuming contingency reserve is always included in the cost baseline.

• Reality: PMBOK v8 presents two scenarios—one including contingency reserve in the cost baseline (left side) and one excluding it (right side). The exam may test both possibilities.

• Trap: Confusing management reserve with contingency reserve regarding change control authority.

• Reality: Management reserves can be changed only through formal change control procedures; contingency reserves may have delegated authority to the project manager.

• Trap: Believing contingency reserves are only for cost, not schedule.

• Reality: Reserves mitigate cost AND/OR schedule risk. Contingency reserves can be time or money allocated in the schedule or cost baseline.

Important PMI Connections

Quick Review Questions

1. What distinguishes a contingency reserve from a management reserve in terms of risk classification?

2. A project manager needs additional funds for a risk that was not identified during planning. Which type of reserve would be used, and what process must be followed to access it?

3. When the cost baseline includes contingency reserve, does it also include management reserve? Why or why not?

4. Your project has a known risk of potential rework for three deliverables. You allocate $30,000 in the budget for this. Is this a contingency reserve or a management reserve?

5. A stakeholder asks why the project budget includes funds that are not part of the cost baseline. What type of reserve are they referring to, and what is its purpose?

PMBOK v8 Reference

Section 2.7 - Risk Performance Domain (Reserves discussion) Figure 2-25 - Cost Baseline Scenarios (Including/Excluding Contingency Reserve) Glossary - Definition of "reserve"