A Reserve Is a Provision to Mitigate Cost and Schedule Risks

PMBOK v8 Definition

A reserve is a provision in the project management plan to mitigate cost and/or schedule risks. It is 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).

Why It Matters for the Exam

Reserve concepts appear frequently in PMI exam questions on cost management, schedule management, and risk management. You will encounter them in situational questions asking which type of reserve to use for specific risks, in definition questions distinguishing contingency from management reserves, and in questions about what is included in the cost baseline versus the project budget.

Key Points to Remember (for the exam)

• 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: Budget or time for unknown-unknowns; not part of the cost baseline; requires formal change control to use
• Cost Baseline Scenarios: May include contingency reserve (left side of Figure 2-25) or exclude it (right side); management reserve is always excluded
• Authority of Usage: Contingency reserve can be used by the project manager within defined thresholds; management reserve requires formal change control procedures
• Reserve Analysis: Method to evaluate the amount of risk on the project and determine whether the reserve is sufficient for the remaining risk
• Risk Classification: Known-unknowns → contingency reserve; unknown-unknowns → management reserve
• Location in Budget: Contingency reserve is part of the cost baseline or project budget; management reserve is part of the overall project budget but outside the baseline

Typical PMI Exam Example

A project manager is estimating costs for a construction project. The team identifies several risks, including potential rework for concrete foundations (estimated at $50,000) and possible weather delays (estimated at 10 days). The project manager adds $50,000 and 10 days to the schedule and cost baselines for these identified risks. What type of reserve is being used?

Answer: Contingency reserve (for known-unknowns with active response strategies).

PMI Exam Traps

• Trap: Confusing contingency reserve with management reserve based on "reserve" alone

  • Reality: Contingency reserve = known-unknowns (identified risks); management reserve = unknown-unknowns (unforeseen work)

• Trap: Assuming all reserves are included in the cost baseline

  • Reality: Contingency reserve may be inside OR outside the cost baseline (two scenarios in Figure 2-25); management reserve is ALWAYS outside the cost baseline

• Trap: Thinking management reserve can be used without formal change control

  • Reality: Management reserves can be changed only through formal change control procedures

• Trap: Confusing reserve analysis with other analytical techniques

  • Reality: Reserve analysis specifically evaluates whether the remaining reserve is sufficient for remaining risk; it is not about estimating initial reserves

Important PMI Connections

Quick Review Questions

1. What type of reserve addresses known-unknowns and is allocated in the initial project budget?

2. Can management reserve be used without formal change control procedures? Why or why not?

3. What is the difference between the two scenarios shown in Figure 2-25 regarding contingency reserve?

4. What analytical technique is used to evaluate whether the remaining reserve is sufficient for the remaining risk?

5. If a project has identified risks with active response strategies, which type of reserve should be established?

PMBOK v8 Reference

Section 2.7 - Risk Performance Domain (as referenced in the context) and the definitions in the PMBOK v8 glossary for "reserve," "contingency reserve," and "management reserve."