The Schedule Baseline Is the Approved Version of a Schedule Model

PMBOK v8 Definition

The schedule baseline is the approved version of a schedule model that can be changed using formal change control procedures and is used as the basis for comparison to actual results. It is accepted and approved by the appropriate stakeholders as the baseline for the schedule, with baseline start dates and baseline finish dates. The schedule baseline is a component of the project management plan.

Why It Matters for the Exam

The schedule baseline appears frequently in PMI exam questions about monitoring and controlling project work, variance analysis, and integrated change control. Expect questions that test your understanding of what constitutes a baseline change versus normal schedule updates, and which process governs baseline modifications.

Key Points to Remember (for the exam)

• Definition: Approved version of a schedule model, changeable only through formal change control procedures
• Purpose: Basis for comparison to actual results during monitoring and controlling
• Components: Includes baseline start dates and baseline finish dates for all activities
• Location: Component of the project management plan
• Change Authority: Can only be modified through the Assess and Implement Changes process (integrated change control)
• Comparison: During monitoring and controlling, approved baseline dates are compared to actual start and finish dates to determine variances
• Common Confusion: Schedule baseline ≠ schedule model; the baseline is the approved version of the model

Typical PMI Exam Example

A project manager is reviewing the project schedule and notices that activity durations are 20% longer than planned. The project sponsor asks for an adjustment to the schedule. The project manager explains that any changes to the schedule baseline require formal change control procedures and approval through the Assess and Implement Changes process.

PMI Exam Traps

• Trap: Confusing schedule baseline updates with regular schedule updates

  • Reality: Only significant changes requiring formal approval constitute baseline updates; routine status updates do not change the baseline

• Trap: Thinking the schedule baseline can be adjusted by the project manager alone

  • Reality: Only through the Assess and Implement Changes process (integrated change control) can the baseline be modified

• Trap: Confusing schedule baseline with schedule data

  • Reality: Schedule baseline is the approved timeline; schedule data includes milestones, activities, attributes, assumptions, and constraints

• Trap: Believing the schedule baseline is independent of other baselines

  • Reality: Together with cost and scope baselines, it forms the project's integrated baseline

Important PMI Connections

Quick Review Questions

1. What is the only process through which the schedule baseline can be modified?

2. What three baselines together form the project's integrated baseline?

3. During which process group are baseline dates compared to actual dates to determine variances?

4. What is the difference between the schedule baseline and schedule data?

5. Who must approve changes to the schedule baseline?

PMBOK v8 Reference

Section 4 – Inputs and Outputs (Schedule Baseline definition and schedule baseline updates)
Section on Monitor and Control Schedule (Monitoring and Controlling Focus Area)